As the title suggests, hide/disable the desktop game window while in VR mode. Since a VR headset is essentially 2 screens then having the desktop window also present in this scenario makes for a total of 3 screens being rendered and our performance is split 2/3 to our VR Headset and 1/3 into an unused desktop window which cannot be seen since we have a VR headset on our face. Of course this should be an optional setting.