About vr.PixelDensity

In OculusGo using vr.PixelDensity certainly improved the resolution but when shifting from Level A to Level B somehow the screen gets darker and BGM only sounds.
The value of vr.PixelDensity of Level A is set to 1.5 and the value of Level B vr.PixelDensity is set to 1.2.
If you have something to know, please give me a professor