I tend to go in and out of full-screen mode a lot. I only enter full screen when I'm watching something. However, I somehow got to the point where "exit full screen" just gives me the same window, with no title bar. I can use alt+space -> Move the window down, but there's still no title bar to resize or move. I can also alt+space -> Size, but once I go fullscreen again, once I exit full screen, it still takes up the whole screen.
I also can't find any button to close/quit the app from within the app.