This is a general issue for software I find - where is function X [now] (when I know function X exists).
For settings, eg on phones, MS Windows, Linux, this used to be a big problem to and it has been solved by simply including a settings search.
Is it time apps had a "search" on the application menu that would then open the relevant dialog, or perhaps optionally allow the finding of the menu item (eg open the menu, open the sub-menu, highlight the menu item that opens the dialog, pause, open the dialog)?
I had the same issue earlier, where is the Voice settings in Steam -- it strikes me if I can type "voice" in a function-search on the main menu that would be better than trawling for help info online.
In 2.8, the mouse buttons have different meaning.
Still, the UI has gone from appallingly bad a decade ago to sort of OK in 2.79. Haven't tried 2.8 yet; it's still in beta.