How can I exit full screen mode?

[Moon1moon]

I know this might not be the best place to ask, but I couldn't find the answer on web. I've gone through the settings and reviewed the GUI, but I still can't find an option to exit full screen mode. I've tried deleting and reinstalling the app, as well as removing any config files I could find. I even tested different versions, but nothing seems to work. Any idea?