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. Due to the high power consumption and heat generation of large games, the phone's temperature will naturally increase, which is normal. If you feel that the temperature is too high while gaming, it is recommended to lower the frame rate and graphics quality, and close unused APPs in the background to reduce the load, which can help improve the issue.
For your reference, here are the paths to adjust the refresh rate:
1. Go to [Settings];
2. Tap [Display & brightness];
3. You can select [Refresh rate], and adjust the refresh rate.