As I said, I also tried the local profile for that game. There were only 2 possible 3D: z adaptive and z-normal. Not geometry. Changing the 3D strength changed nothing. I have shadows on low, and I’m running in window mode. Following your advice, I created a copy of the base unity 5, then applied it before I ran the game. No 3-D. It does hook, with all profiles, and I can play full VR, but not immersive mode.
As a test, I tried my GOG version of Witcher 3 with the local profile. There, it worked. 3D in immersive works on all 3 settings.
Kind of at a loss…