Hey i might be blind but my game always starts in a window and i see no option for fullscreen.
This might be a bug?
I didn't see one either. alt+enter should do it though.
Sorry im dumb i just had to press F11 for fullscreen.
The game initially started in a window for some reason.
If the game still starts at windowed until you open a save file, turn off Automatic Screen Res in video settings
