Why does the POCO X6 Pro screen turn red/green when viewed at an angle?

Thank you for your support of Xiaomi products. The POCO X6 Pro has undergone rigorous inspection before leaving the factory to ensure the phone meets Xiaomi's specifications, so you can use them with confidence.
The POCO X6 Pro uses advanced OLED technology with the latest generation of luminous materials to enhance screen brightness. When viewing the phone at an angle, slight color differences can occur due to the different refraction of light from various colors. This is a normal phenomenon. You can also adjust the color of the display as your preference.

For your reference, here is the method:
Go to [Settings] >> [Display & brightness] >> [Color scheme] >> adjust the position of the dots on the color temperature dial, and change the preference for screen display effects.