Not a lot you should adjust once it goes to Dolby Vision HDR pic mode, but I set smooth gradation to ON, cut Reality Creation OFF, adjusted MotionFlow, and you need to set Color Temp to Expert 1.
Updated my my ATV4K to Beta 11.3 and 940E to get Dolbyvision. I run the ATV4K through a Denon 1400H to the 940E. Tried to watch Bright on Netflix app on ATV4K but don’t seem to be getting DV getting to the 940E. Am I missing a step?
Sorry made rookie mistake. Forgot to look at ATV4K settings. The Match Content was off and the format was set to HDR. Set Match Content to on and all is well!