Currently, we can view the “TOC/Tumbnails/Bookmarks” only as a popup which disappears all the time when clicking outside of this popup.
Would be nice to have the possibility to set a fixed panel (on the right or on the left side) with the three Tabs “TOC/Tumbnails/Bookmarks”. So the panel is viewed all the time while reading/studying the document.
(Look at the “Search”-Button: we can place the “Search”-View as a popup and as a right side fixed panel)