Xbox: Game color and gamma is so much better if.....
You go to: Settings - General - TV & Display Options - Video Modes
And turn OFF Allow HDR10
This will stop HDR being forced into the game due to the game having HDR built in.
The game looks so much better.
Note: If you have a top of the range 4k t.v / monitor it may look good having HDR on but your average 4k t.v / monitor makes the color look washed out.....it will also fix dark area issues.
Hope it helps, it has me.