You can call out the control center or go to Settings--Display and brightness, and adjust the screen brightness by dragging the brightness bar.
If the screen brightness automatically decreases or dims, try the following methods:
1. Go to Settings--Display and brightness, and check whether Auto-brightness is enabled. If yes, the screen brightness automatically changes with the environmental light intensity. You can disable this feature and try again.
2. The screen brightness automatically decreases or dims when the phone heats up. The phone naturally heats up when being used. If the environment is hot and the phone is running a resource-intensive app, the heating will be more obvious. To prevent the phone temperature from continued rise, the built-in protection mechanism will properly decrease screen brightness to reduce power consumption so as to reduce heating and guarantee the safe use of the phone. After the phone cools down, the screen will resume the original brightness. You can rest assured to use your phone.
