Thank you for your support of Xiaomi products. All mobile phones undergo strict professional inspection before leaving the factory, so you can use them with confidence. You will notice slight changes in color and chromaticity for OLED products. This is a normal phenomenon due to the characteristics of OLED.
You can try the following steps to adjust the screen colors:
1. Go to the [Settings] APP on your phone;
2. Slide down the screen and tap [Display & brightness];
3. Tap [Color scheme] and adjust the position of the point in the color temperature dial, and change the preference of the screen display effect.
Does it help?