That is not bad if it is dark gray in the photo especially with TT and NS on!My screen is not uniform either. I have a strong green tint on my screen (visible in all apps and settings etc) and you can see in the photo the middle of the screen is greenish and the sides are magenta, it’s my second replacement with this problem. It’s useless for editing photos like this. This one is going back as well, I’m not sure if I’m asking for a refund now
(it’s a 12 mini by the way and True Tone, night shift etc are enabled)
Can you take a photo how it shows in brighter screens, like setting menu with light theme?