I must be thick, because I can't figure out how to do this. I have a 4200, so maybe its different. But, can you slow down the steps here a bit. I go into CarPlay. Then I hit the "home button"... I am assuming you are talking about the physical home button on the 4200, and that takes me to the main Pioneer home screen... not in CarPlay any longer. I then go into settings and there is no "Picture Adjustments" setting that I can find on any menu. The closest thing is under Themes, there is an Illumination setting but can't figure out what that does... no adjustment ability there.
Also,