diff --git a/frontend/src/components/common/seahub-modal-close.js b/frontend/src/components/common/seahub-modal-close.js
index c7023fefb6..2d6631b14e 100644
--- a/frontend/src/components/common/seahub-modal-close.js
+++ b/frontend/src/components/common/seahub-modal-close.js
@@ -4,7 +4,7 @@ import '../../css/seahub-modal-header.css';
 
 const SeahubModalCloseIcon = (props) => {
   return (
-    <button type="button" className={`close seahub-modal-btn ${props.className ? props.className : ''}`} data-dismiss="modal" aria-label={gettext('Close')} onClick={props.toggle}>
+    <button type="button" className={`close seahub-modal-btn ${props.className ? props.className : ''}`} data-dismiss="modal" aria-label={gettext('Close')} title={gettext('Close')} onClick={props.toggle}>
       <span className="seahub-modal-btn-inner">
         <i className="sf3-font sf3-font-x-01" aria-hidden="true"></i>
       </span>
diff --git a/frontend/src/components/common/seahub-modal-header.js b/frontend/src/components/common/seahub-modal-header.js
index 47163b733b..2d0c88065a 100644
--- a/frontend/src/components/common/seahub-modal-header.js
+++ b/frontend/src/components/common/seahub-modal-header.js
@@ -5,7 +5,7 @@ import '../../css/seahub-modal-header.css';
 
 const SeahubModalHeader = ({ children, ...props }) => {
   const customCloseBtn = (
-    <button type="button" className="close seahub-modal-btn" data-dismiss="modal" aria-label={gettext('Close')} onClick={props.toggle}>
+    <button type="button" className="close seahub-modal-btn" data-dismiss="modal" aria-label={gettext('Close')} title={gettext('Close')} onClick={props.toggle}>
       <span className="seahub-modal-btn-inner">
         <i className="sf3-font sf3-font-x-01" aria-hidden="true"></i>
       </span>
diff --git a/frontend/src/components/cur-dir-path/dir-path.js b/frontend/src/components/cur-dir-path/dir-path.js
index 30f35f22b9..f2e3d5d834 100644
--- a/frontend/src/components/cur-dir-path/dir-path.js
+++ b/frontend/src/components/cur-dir-path/dir-path.js
@@ -21,6 +21,7 @@ const propTypes = {
   pathPrefix: PropTypes.array,
   fileTags: PropTypes.array.isRequired,
   toggleTreePanel: PropTypes.func.isRequired,
+  isTreePanelShown: PropTypes.bool.isRequired,
   repoEncrypted: PropTypes.bool.isRequired,
   enableDirPrivateShare: PropTypes.bool.isRequired,
   userPerm: PropTypes.string.isRequired,
@@ -201,7 +202,7 @@ class DirPath extends React.Component {
               onUploadFolder={this.props.onUploadFolder}
               loadDirentList={this.props.loadDirentList}
             >
-              <span className="path-file-name">{item}</span>
+              <span className="last-path-item" title={item}>{item}</span>
             </DirOperationToolbar>
           </Fragment>
         );
@@ -217,7 +218,9 @@ class DirPath extends React.Component {
               onDragLeave={this.onDragLeave}
               onDragOver={this.onDragOver}
               onDrop={this.onDrop}
-              role="button">
+              role="button"
+              title={item}
+            >
               {item}
             </span>
           </Fragment>
@@ -228,30 +231,34 @@ class DirPath extends React.Component {
   };
 
   render() {
-    const { currentPath, repoName } = this.props;
+    const { currentPath, repoName, isTreePanelShown } = this.props;
     const pathElem = this.turnPathToLink(currentPath);
     return (
       <div className="path-container dir-view-path">
-        <span className="cur-view-path-btn mr-1" onClick={this.props.toggleTreePanel}>
+        <span
+          className="cur-view-path-btn mr-1"
+          title={isTreePanelShown ? gettext('Close the panel') : gettext('Open the panel')}
+          onClick={this.props.toggleTreePanel}
+        >
           <span className="sf3-font-side-bar sf3-font"></span>
         </span>
         {this.props.pathPrefix && this.props.pathPrefix.map((item, index) => {
           return (
             <Fragment key={index}>
-              <Link to={item.url} className="path-item normal" onClick={(e) => this.onTabNavClick(e, item.name, item.id)}>{gettext(item.showName)}</Link>
+              <Link to={item.url} className="path-item normal" onClick={(e) => this.onTabNavClick(e, item.name, item.id)} title={gettext(item.showName)}>{gettext(item.showName)}</Link>
               <span className="path-split">/</span>
             </Fragment>
           );
         })}
         {this.props.pathPrefix && this.props.pathPrefix.length === 0 && (
           <>
-            <Link to={siteRoot + 'libraries/'} className="path-item normal" onClick={(e) => this.onTabNavClick(e, 'libraries')}>{gettext('Files')}</Link>
+            <Link to={siteRoot + 'libraries/'} className="flex-shrink-0 path-item normal" onClick={(e) => this.onTabNavClick(e, 'libraries')}>{gettext('Files')}</Link>
             <span className="path-split">/</span>
           </>
         )}
         {!this.props.pathPrefix && (
           <>
-            <Link to={siteRoot + 'libraries/'} className="path-item normal" onClick={(e) => this.onTabNavClick(e, 'libraries')}>{gettext('Files')}</Link>
+            <Link to={siteRoot + 'libraries/'} className="flex-shrink-0 path-item normal" onClick={(e) => this.onTabNavClick(e, 'libraries')}>{gettext('Files')}</Link>
             <span className="path-split">/</span>
           </>
         )}
@@ -271,9 +278,9 @@ class DirPath extends React.Component {
             onUploadFolder={this.props.onUploadFolder}
             loadDirentList={this.props.loadDirentList}
           >
-            <span className="path-repo-name">{repoName}</span>
+            <span className="last-path-item" title={repoName}>{repoName}</span>
           </DirOperationToolbar> :
-          <span className="path-item" data-path="/" onClick={this.onPathClick} role="button">{repoName}</span>
+          <span className="path-item" data-path="/" onClick={this.onPathClick} role="button" title={repoName}>{repoName}</span>
         }
         {pathElem}
       </div>
diff --git a/frontend/src/components/cur-dir-path/index.js b/frontend/src/components/cur-dir-path/index.js
index fcb54a386e..5906ffea21 100644
--- a/frontend/src/components/cur-dir-path/index.js
+++ b/frontend/src/components/cur-dir-path/index.js
@@ -14,6 +14,7 @@ const propTypes = {
   pathPrefix: PropTypes.array,
   fileTags: PropTypes.array.isRequired,
   toggleTreePanel: PropTypes.func.isRequired,
+  isTreePanelShown: PropTypes.bool.isRequired,
   direntList: PropTypes.array,
   sortBy: PropTypes.string,
   sortOrder: PropTypes.string,
@@ -63,6 +64,7 @@ class CurDirPath extends React.Component {
           onTabNavClick={this.props.onTabNavClick}
           fileTags={this.props.fileTags}
           toggleTreePanel={this.props.toggleTreePanel}
+          isTreePanelShown={this.props.isTreePanelShown}
           enableDirPrivateShare={this.props.enableDirPrivateShare}
           showShareBtn={this.props.showShareBtn}
           onUploadFile={this.props.onUploadFile}
diff --git a/frontend/src/components/dialog/about-dialog.js b/frontend/src/components/dialog/about-dialog.js
index 43f742cc02..334ad4332d 100644
--- a/frontend/src/components/dialog/about-dialog.js
+++ b/frontend/src/components/dialog/about-dialog.js
@@ -28,7 +28,7 @@ class AboutDialog extends React.Component {
       return (
         <Modal isOpen={true} toggle={toggleDialog}>
           <ModalBody>
-            <button type="button" className="close seahub-modal-btn p-0" aria-label={gettext('Close')} onClick={toggleDialog}>
+            <button type="button" className="close seahub-modal-btn p-0" aria-label={gettext('Close')} title={gettext('Close')} onClick={toggleDialog}>
               <span className="seahub-modal-btn-inner">
                 <i className="sf3-font sf3-font-x-01" aria-hidden="true"></i>
               </span>
@@ -41,7 +41,7 @@ class AboutDialog extends React.Component {
       return (
         <Modal isOpen={true} toggle={toggleDialog}>
           <ModalBody>
-            <button type="button" className="close seahub-modal-btn p-0" aria-label={gettext('Close')} onClick={toggleDialog}>
+            <button type="button" className="close seahub-modal-btn p-0" aria-label={gettext('Close')} title={gettext('Close')} onClick={toggleDialog}>
               <span className="seahub-modal-btn-inner">
                 <i className="sf3-font sf3-font-x-01" aria-hidden="true"></i>
               </span>
diff --git a/frontend/src/components/dialog/copy-dirent-dialog.js b/frontend/src/components/dialog/copy-dirent-dialog.js
index 7475f39ba0..79b03180d1 100644
--- a/frontend/src/components/dialog/copy-dirent-dialog.js
+++ b/frontend/src/components/dialog/copy-dirent-dialog.js
@@ -322,13 +322,13 @@ class CopyDirent extends React.Component {
         <ModalHeader toggle={this.toggle}
           close={
             <div className="header-buttons">
-              <button type="button" className="close seahub-modal-btn" data-dismiss="modal" aria-label={gettext('Close')} onClick={this.toggle}>
+              <button type="button" className="close seahub-modal-btn" data-dismiss="modal" aria-label={gettext('Close')} title={gettext('Close')} onClick={this.toggle}>
                 <span className="seahub-modal-btn-inner">
                   <i className="sf3-font sf3-font-x-01" aria-hidden="true"></i>
                 </span>
               </button>
               {(isPro && !showSearchBar) &&
-                <button type="button" className="close seahub-modal-btn" data-dismiss="modal" aria-label={gettext('Search')} onClick={this.onOpenSearchBar}>
+                <button type="button" className="close seahub-modal-btn" data-dismiss="modal" aria-label={gettext('Search')} title={gettext('Search')} onClick={this.onOpenSearchBar}>
                   <span className="seahub-modal-btn-inner">
                     <i className="sf3-font sf3-font-search" aria-hidden="true"></i>
                   </span>
diff --git a/frontend/src/components/dialog/guide-for-new-dialog.js b/frontend/src/components/dialog/guide-for-new-dialog.js
index aeffeaa8c6..e0721506b6 100644
--- a/frontend/src/components/dialog/guide-for-new-dialog.js
+++ b/frontend/src/components/dialog/guide-for-new-dialog.js
@@ -18,7 +18,7 @@ class GuideForNewDialog extends React.Component {
     return (
       <Modal isOpen={true} toggle={this.toggle}>
         <ModalBody>
-          <button type="button" className="close seahub-modal-btn p-0" aria-label={gettext('Close')} onClick={this.toggle}>
+          <button type="button" className="close seahub-modal-btn p-0" aria-label={gettext('Close')} title={gettext('Close')} onClick={this.toggle}>
             <span className="seahub-modal-btn-inner">
               <i className="sf3-font sf3-font-x-01" aria-hidden="true"></i>
             </span>
diff --git a/frontend/src/components/dialog/move-dirent-dialog.js b/frontend/src/components/dialog/move-dirent-dialog.js
index a4f3425c0d..cd8d69b4ee 100644
--- a/frontend/src/components/dialog/move-dirent-dialog.js
+++ b/frontend/src/components/dialog/move-dirent-dialog.js
@@ -323,13 +323,13 @@ class MoveDirentDialog extends React.Component {
         <ModalHeader toggle={this.toggle}
           close={
             <div className="header-buttons">
-              <button type="button" className="close seahub-modal-btn" data-dismiss="modal" aria-label={gettext('Close')} onClick={this.toggle}>
+              <button type="button" className="close seahub-modal-btn" data-dismiss="modal" aria-label={gettext('Close')} title={gettext('Close')} onClick={this.toggle}>
                 <span className="seahub-modal-btn-inner">
                   <i className="sf3-font sf3-font-x-01" aria-hidden="true"></i>
                 </span>
               </button>
               {(isPro && !showSearchBar) &&
-                <button type="button" className="close seahub-modal-btn" data-dismiss="modal" aria-label={gettext('Search')} onClick={this.onOpenSearchBar}>
+                <button type="button" className="close seahub-modal-btn" data-dismiss="modal" aria-label={gettext('Search')} title={gettext('Search')} onClick={this.onOpenSearchBar}>
                   <span className="seahub-modal-btn-inner">
                     <i className="sf3-font sf3-font-search" aria-hidden="true"></i>
                   </span>
diff --git a/frontend/src/components/dialog/trash-dialog/index.js b/frontend/src/components/dialog/trash-dialog/index.js
index 93a6ed3e80..e68fae6bfb 100644
--- a/frontend/src/components/dialog/trash-dialog/index.js
+++ b/frontend/src/components/dialog/trash-dialog/index.js
@@ -201,7 +201,7 @@ class TrashDialog extends React.Component {
                   <button className="btn btn-secondary clean flex-shrink-0 ml-4" onClick={this.cleanTrash}>{gettext('Clean')}</button>
                 }
                 {isDesktop && (
-                  <button type="button" className="close seahub-modal-btn" aria-label={gettext('Close')} onClick={toggleTrashDialog}>
+                  <button type="button" className="close seahub-modal-btn" aria-label={gettext('Close')} title={gettext('Close')}onClick={toggleTrashDialog}>
                     <span className="seahub-modal-btn-inner">
                       <i className="sf3-font sf3-font-x-01" aria-hidden="true"></i>
                     </span>
diff --git a/frontend/src/components/dirent-detail/detail/header/index.js b/frontend/src/components/dirent-detail/detail/header/index.js
index f7ea35cbdb..452caba223 100644
--- a/frontend/src/components/dirent-detail/detail/header/index.js
+++ b/frontend/src/components/dirent-detail/detail/header/index.js
@@ -1,5 +1,6 @@
 import React from 'react';
 import PropTypes from 'prop-types';
+import { gettext } from '../../../../utils/constants';
 import Icon from '../../../icon';
 import Title from './title';
 
@@ -14,7 +15,7 @@ const Header = ({ title, icon, iconSize = 32, onClose, children, component = {}
         <div className="detail-control-container">
           {children}
           {onClose && (
-            <div className="detail-control" onClick={onClose}>
+            <div className="detail-control" onClick={onClose} title={gettext('Close')}>
               {closeIcon ? closeIcon : <Icon symbol="close" className="detail-control-icon" />}
             </div>
           )}
diff --git a/frontend/src/components/dirent-list-view/dirent-list-item.js b/frontend/src/components/dirent-list-view/dirent-list-item.js
index e608f9bfc6..a40bc2f957 100644
--- a/frontend/src/components/dirent-list-view/dirent-list-item.js
+++ b/frontend/src/components/dirent-list-view/dirent-list-item.js
@@ -806,6 +806,7 @@ class DirentListItem extends React.Component {
                 <i
                   role="button"
                   aria-label={dirent.starred ? gettext('Unstar') : gettext('Star')}
+                  title={dirent.starred ? gettext('Unstar') : gettext('Star')}
                   onClick={this.onItemStarred}
                   className={`sf3-font ${dirent.starred ? 'sf3-font-star' : 'sf3-font-star-empty'}`}
                 >
diff --git a/frontend/src/components/files-sub-nav.js b/frontend/src/components/files-sub-nav.js
index 3e7c510c0f..18c2da998a 100644
--- a/frontend/src/components/files-sub-nav.js
+++ b/frontend/src/components/files-sub-nav.js
@@ -34,11 +34,11 @@ class FilesSubNav extends React.Component {
             <li key={item.id} className={`nav-item ${this.getActiveClass(item.name)}`}>
               <Link
                 to={siteRoot + 'group/' + item.id + '/'}
-                className={`nav-link ellipsis ${this.getActiveClass(item.name)}`}
+                className={`nav-link ${this.getActiveClass(item.name)}`}
                 onClick={(e) => this.tabItemClick(e, item.name, item.id)}
               >
                 <span className={`${item.parent_group_id == 0 ? 'sf3-font-group' : 'sf3-font-department'} sf3-font nav-icon`} aria-hidden="true"></span>
-                <span className="nav-text">{item.name}</span>
+                <span className="nav-text ellipsis" title={item.name}>{item.name}</span>
               </Link>
             </li>
           );
@@ -52,23 +52,35 @@ class FilesSubNav extends React.Component {
       <>
         {canAddRepo && (
           <li className={`nav-item ${this.getActiveClass('my-libs') || this.getActiveClass('deleted')}`}>
-            <Link to={ siteRoot + 'my-libs/' } className={`nav-link ellipsis ${this.getActiveClass('my-libs') || this.getActiveClass('deleted') }`} title={gettext('My Libraries')} onClick={(e) => this.tabItemClick(e, 'my-libs')}>
+            <Link
+              to={siteRoot + 'my-libs/'}
+              className={`nav-link ${this.getActiveClass('my-libs') || this.getActiveClass('deleted') }`}
+              onClick={(e) => this.tabItemClick(e, 'my-libs')}
+            >
               <span className="sf3-font-mine sf3-font nav-icon" aria-hidden="true"></span>
-              <span className="nav-text">{gettext('My Libraries')}</span>
+              <span className="nav-text ellipsis" title={gettext('My Libraries')}>{gettext('My Libraries')}</span>
             </Link>
           </li>
         )}
         <li className={`nav-item ${this.getActiveClass('shared-libs')}`}>
-          <Link to={siteRoot + 'shared-libs/'} className={`nav-link ellipsis ${this.getActiveClass('shared-libs')}`} title={gettext('Shared with me')} onClick={(e) => this.tabItemClick(e, 'shared-libs')}>
+          <Link
+            to={siteRoot + 'shared-libs/'}
+            className={`nav-link ${this.getActiveClass('shared-libs')}`}
+            onClick={(e) => this.tabItemClick(e, 'shared-libs')}
+          >
             <span className="sf3-font-share-with-me sf3-font nav-icon" aria-hidden="true"></span>
-            <span className="nav-text">{gettext('Shared with me')}</span>
+            <span className="nav-text ellipsis" title={gettext('Shared with me')}>{gettext('Shared with me')}</span>
           </Link>
         </li>
         {canViewOrg &&
-        <li className={`nav-item ${this.getActiveClass('org')}`} onClick={(e) => this.tabItemClick(e, 'org')}>
-          <Link to={ siteRoot + 'org/' } className={`nav-link ellipsis ${this.getActiveClass('org')}`} title={gettext('Shared with all')}>
+        <li className={`nav-item ${this.getActiveClass('org')}`}>
+          <Link
+            to={siteRoot + 'org/'}
+            className={`nav-link ${this.getActiveClass('org')}`}
+            onClick={(e) => this.tabItemClick(e, 'org')}
+          >
             <span className="sf3-font-share-with-all sf3-font nav-icon" aria-hidden="true"></span>
-            <span className="nav-text">{gettext('Shared with all')}</span>
+            <span className="nav-text ellipsis" title={gettext('Shared with all')}>{gettext('Shared with all')}</span>
           </Link>
         </li>
         }
diff --git a/frontend/src/components/search/search.js b/frontend/src/components/search/search.js
index b1f99122c0..86528423f5 100644
--- a/frontend/src/components/search/search.js
+++ b/frontend/src/components/search/search.js
@@ -925,6 +925,7 @@ class Search extends Component {
                     className="search-icon-right sf3-font sf3-font-x-01"
                     onClick={this.onClearSearch}
                     aria-label={gettext('Clear search')}
+                    title={gettext('Clear search')}
                   >
                   </button>
                 }
@@ -983,6 +984,7 @@ class Search extends Component {
                       className="search-icon-right input-icon-addon sf3-font sf3-font-x-01"
                       onClick={this.onClearSearch}
                       aria-label={gettext('Clear search')}
+                      title={gettext('Clear search')}
                     >
                     </button>
                   }
diff --git a/frontend/src/components/share-link-panel/link-item.js b/frontend/src/components/share-link-panel/link-item.js
index 929dc709e6..2f674ff44e 100644
--- a/frontend/src/components/share-link-panel/link-item.js
+++ b/frontend/src/components/share-link-panel/link-item.js
@@ -155,7 +155,7 @@ class LinkItem extends React.Component {
               onChange={this.toggleSelectLink}
             />
           </td>
-          <td>
+          <td title={link}>
             {this.cutLink(link)}
           </td>
           <td>
diff --git a/frontend/src/css/lib-content-view.css b/frontend/src/css/lib-content-view.css
index 16fadf8e0a..75f42f6d4e 100644
--- a/frontend/src/css/lib-content-view.css
+++ b/frontend/src/css/lib-content-view.css
@@ -261,12 +261,12 @@
 .dir-view-path .path-item,
 .dir-view-path .last-path-item {
   display: inline-block;
-  min-width: 0; /* overwrite some styles */
   padding: 0 6px;
   font-size: 1rem;
   color: inherit;
   border-radius: 3px;
   text-decoration: none;
+  min-width: 28px;
   max-width: 172px;
   overflow: hidden;
   text-overflow: ellipsis;
diff --git a/frontend/src/metadata/components/metadata-details/settings-icon.js b/frontend/src/metadata/components/metadata-details/settings-icon.js
index ffaa101dae..2ae0606df6 100644
--- a/frontend/src/metadata/components/metadata-details/settings-icon.js
+++ b/frontend/src/metadata/components/metadata-details/settings-icon.js
@@ -1,4 +1,5 @@
 import React, { useMemo, useCallback, useState } from 'react';
+import { gettext } from '../../../utils/constants';
 import Icon from '../../../components/icon';
 import HideColumnPopover from '../popover/hidden-column-popover';
 import { useMetadataDetails } from '../../hooks';
@@ -21,7 +22,7 @@ const SettingsIcon = () => {
 
   return (
     <>
-      <div className="detail-control mr-2" id={target} onClick={onSetterToggle}>
+      <div className="detail-control mr-2" id={target} onClick={onSetterToggle} title={gettext('Settings')}>
         <Icon symbol="set-up" className="detail-control-icon" />
       </div>
       {isShowSetter && (
diff --git a/frontend/src/pages/lib-content-view/lib-content-view.js b/frontend/src/pages/lib-content-view/lib-content-view.js
index acf2bd02cb..63be61d771 100644
--- a/frontend/src/pages/lib-content-view/lib-content-view.js
+++ b/frontend/src/pages/lib-content-view/lib-content-view.js
@@ -2442,6 +2442,7 @@ class LibContentView extends React.Component {
                             sortOrder={this.state.sortOrder}
                             sortItems={this.sortItems}
                             toggleTreePanel={this.toggleTreePanel}
+                            isTreePanelShown={this.state.isTreePanelShown}
                             enableDirPrivateShare={enableDirPrivateShare}
                             showShareBtn={showShareBtn}
                             onUploadFile={this.onUploadFile}
diff --git a/frontend/src/pages/wiki2/wiki-trash-dialog.js b/frontend/src/pages/wiki2/wiki-trash-dialog.js
index 42ee73232e..99ed020fd7 100644
--- a/frontend/src/pages/wiki2/wiki-trash-dialog.js
+++ b/frontend/src/pages/wiki2/wiki-trash-dialog.js
@@ -97,7 +97,7 @@ class WikiTrashDialog extends React.Component {
                 {(isAdmin && enableUserCleanTrash) &&
                   <button className="btn btn-secondary clean" onClick={this.cleanTrash}>{gettext('Clean')}</button>
                 }
-                <button type="button" className="close seahub-modal-btn" aria-label={gettext('Close')} onClick={toggleTrashDialog}>
+                <button type="button" className="close seahub-modal-btn" aria-label={gettext('Close')} title={gettext('Close')} onClick={toggleTrashDialog}>
                   <span className="seahub-modal-btn-inner">
                     <i className="sf3-font sf3-font-x-01" aria-hidden="true"></i>
                   </span>