At the moment, we can switch to Desktop mode or VR mode on demand but it's not possible to see the Desktop while in the VR world.
It's possible to use OpenVR overlay app like Desktop+ and XSOverlay to do that in SteamVR game, but it does not work with other VR runtime and it adds unnecessary overhead.
Now that VD supports multiple monitor, it has become a viable alternative to Immersed to work in VR, instead of the desktop mode being mostly used to watch videos, launch VR apps and access the desktop occasionally.
Use case for this feature:
  • Providing unlimited VR environment when using Desktop mode (ex: work in Half-Life Alyx)
  • Easily make information accessible while using simulator (lookup an airport map while flying in MSFT)
  • 3D/CAD design using a desktop app while seeing your design in VR.
  • Help develop VR app: if you are working on a VR game, you could work in VR and edit your in-game plugins and assets in a desktop app while seeing the effect of your changes in VR. It would work for anything hot reloadable.
To avoid controller conflict, switching the controller to control the desktop or the game, could be modal like today (long press on the left menu button).