Why does the brightness of the POCO X7 automatically decrease when it heats up?

Thank you for your support of the Xiaomi product. The phone has been inspected strictly before leaving the factory, so you can rest assured of use. To improve the clarity of the displayed content, you can first try to manually increase the brightness of your phone screen or cancel the auto brightness and manually set an appropriate brightness level.
For your reference, here are the paths to these settings:
1. Go to [Settings];
2. Tap [Display & brightness]
3. Swipe right or left to adjust the brightness level, or turn off [Auto brightness].