macos UI: preferences cannot be closed through window buttons
Only the (+) extend button is available:
Same for the simple preferences:
I guess it could make sense if there was changes made, to avoid asking the user whether we should save or discard the changes, but it happens even though no changes have been made.
On the opposite side, multiple applications have their preferences window closable, excluding those that are opening the window in the main application (every electron-based for instance). Most already-installed application are exposing the close:
This also applies to VLC 3.