A way to hide library/bookmarks when side tabs are used, or more compact sidebar

Vlad I just found this thread, after noticing it was removed in the newest update. I think this should be at least considered as an option for those who find it convenient (like me). The reason for this is that it makes the side bar as an easy way to access everything, just like Firefox has (bookmarks, history, synced tabs...) ; especially that the keyboard shortcuts to open the bookmarks and reading list are not very practical to switch from the Bookmarks back to the tab view.