Rift S. I tried messing with window selection but it didn't do much. It launches full screen then shrinks down to a smaller window. I noticed that guardian isn't working when it runs either.
unfortnatley not with the packaged version of the game. the fact that guardian isn't working also makes me think it's not part of the game, make sure you have checked 'enable unknown sources' in oculus settings and have all the unreal engine prerequisite files installed