This fixed it for me, thanks!! But how do I specify launch options so it runs it with '-screen-fullscreen 0' all the time? I ran it in the terminal using `./Lumiette\ for\ Linux.x86_64 -screen-fullscreen 0`.
I don't know much about Linux, but I imagine there is probably a way to incorporate that line into a shortcut of some sort similar to how it's done in Windows.