How to set the screen brightness of the Xiaomi Smart Band 8?

The Xiaomi Smart Band 8 supports automatic screen brightness and custom 225 levels of brightness.
You can set the brightness by the following path:
On the band, open the [Settings] APP >> [Display] >> [Brightness].
[Auto] is enabled by default, which means the screen brightness varies according to the ambient brightness. [Custom] supports manual adjustment to the expected brightness value (Need to turn off [Auto] option to remain effective, otherwise, only this time will take effect).