seahub/frontend/src/css/main-side-nav-folded.css

.side-panel .side-nav-folded {
  overflow: visible;
}

.side-panel .side-nav-folded .side-nav-con {
  overflow: visible;
}

.side-panel .side-nav-folded .nav-item {
  cursor: default;
}

.side-panel .side-nav-folded .nav-item .nav-link:hover {
  transition: all 250ms cubic-bezier(0.25, 0.1, 0.25, 0.1);
}

.side-nav-folded #files-sub-nav {
  width: 240px;
  background: #fff;
  z-index: 2;
  transition: all 250ms cubic-bezier(0.25, 0.1, 0.25, 0.1);
}