seahub/frontend/src/css/select-editor.css

.permission-editor .permission-editor-explanation {
  user-select: none;
  padding-left: 10px;
  color: #9c9c9c;
  font-size: 12px;
  word-break: keep-all;
  word-wrap: break-word;
  white-space: pre-wrap;
}
.permission-editor .permission-editor__option {
  padding-top: 2px;
  padding-bottom: 2px;
}
.permission-editor .permission-editor__control .permission-editor-explanation {
  display: none;
}