[I do not know if this is the right place for it, but here it goes:]
Coming out from this answer given to me on forum of Audacity, I hereby kindly request addition of new option in Preferences: for giving users a choice, if they want their Sidebar to loose its vertical inner scroll-bar when its [folder or unfolded] content exceeds size of its window
[I personally do not like to be forced to scroll within some menus on sites - I prefer to have on overall scroll bar for the whole window]
In concurrence with such change, or even lack of it, the icon for the Keyboard Shortcuts link could be moved then from the bottom of Sidebar to the top most bar, where there is enough space for it [and where it would also remain being always visible]