Github Desktop stuck in full screen mode

Very silly question but I set my Github Desktop to full screen and have not been able to get out of it since then. I have to use keyboard shortcuts to switch to other screens.

I have tried hovering in every nook and corner of the tool hoping a menu bar would slide down or up. To no avail.

No hidden X buttons:

Any idea what is going on and how I can get out of it? Thanks!

ALT-F should pull up a menu where you can turn off full-screen mode.