Your suggestion worked for me. Not sure I was having the same problem as the original post. I would be able to go into VR, stay in VR, but as soon as I switched out of VR, I could not get back in. I had the message of make sure you have Open XR enable, or something like that. Once I switch to disable latest preview on the Developmental Tool setting, and shutdown and restarted the sim, this problem as gone away, and I can freely switch back and fourth.