We were able to use the WMR overlay (WMR start menu) in the beta to open apps inside OpenXR. It was amazing but somehow the update broke it. There are workaround like opening it before loading into the cockpit
Win + Y to activate and then Win key to open the overlay. Try it in the MSFS menu first as it currently breaks inside the cockpit.
It’s strange that nobody is aware of this WMR functionality as it is soo good for siming. You are able o open every app as 2D window inside the cockpit without additional program. But nobody cares about this at the moment apparently as I’ve opened threads about this without any responses…
EDIT: I created a bug report in the forum for the WMR people to upvote if they want to see apps in VR again: WMR start menu overlay crashes VR mode