I'm trying to figure out the noob-friendliest way of doing it. Does the game actually crash (to desktop) when you select fullscreen or do you just get a black screen (with the game still responsive)?
Its weird, as soon as I set any custom resolution and start the game windowed, its fine and playing at 60fps.
As soon as I toggle to fullscreen, game quits running completely and all windows close.
Set the resolution back to 1080p native, toggle to fullscreen, game continues working but locked at 24 FPS.