Here is an old comment of mine, from 2014, from bug #39983, that still is valid: As I have said right from the start, yes, in order to "support" (personally I loathe that word, and would rather say "provide" perhaps) the OS X full-screen mode *properly*, "we" (meaning "anybody who is funded or otherwise bothers to do the work") should also get rid of LO's own full-screen mode, and correspoindingly make sure that when in the OS full-screen mode, corresponding changes to the UI are done, too. My personal opinion is that until that is done, we should just not bother with the OS X full-screen mode. It is not worth it as currently implemented.