is there a way go get PA run in Fullscreen? in the settings is not accepted, and the Hotkey Alt-Enter wont do the trick. i find the UI is very tricky, because overlays (menus) are not updated , after a window resize they show up... Maybe this is better in Fullscreen... when no Windowmanager causes sideffects..?
This is looks like not yet implemented for Linux and Mac. Actually it's depends on drivers you use. For me menus are always resize just fine. Next time when it's happen to you try F5, it's will reload UI. This game most likely will never have modal fullscreen, it's mean it's will always just one of windows controlled by WM, but without border. It's work this way on Windows and even when devs implement this on Linux it's won't be different