I started a project in the Architectural Mode.
Now I would like to activate VR - or kinda switch the project to the VR Mode.
Like the one you can pick at the beginning when you can chose to start a game and you select VR mode.
To start in VR you need to do Project settings >> Description >> Start in VR Check. Also, you need to do a lot to remake your project, migrate VR pawn from the VR template, add naw mesh and etc.