Clicking on folders that you have put in Finders sidebar - It will not display the folder with the view settings set for that folder, but instead the last folder you clicked in the sidebar. It seems to happen clicking from top to bottom vs bottom to top. You just cant make this sh*t up it's so bad.

Example sidebar:

Applications - Always shows as icons

Documents - Shows as icons if you last clicked on Applications. Shows as details if last you clicked on Downloads

Downloads - Always shows as details

Finder is the absolute worst we could write a book about it. Once a year or so all my sidebar folders randomly vanish and I have to re-add them.

Also The most annoying "it's a feature, not a bug" - That instant drop down of the title bar in full screen if the mouse cursor hits the top edge of the screen. So obnoxious with remote desktop sessions. No delay, no way to disable it, no way to change anything about it.