Automatic brightness fits the brightness of your Huawei device's display automatically to the lighting conditions of your surroundings. You can still adjust the brightness manually if needed. 

Android 10 | EMUI 10.0
Step 1:  Open the  settings
Step 2:  Tap on  Display & brightness
Step 3:  Activate or deactivate  Automatic 
  1. Open the settings
  2. Tap on Display & brightness
  3. Activate or deactivate Automatic 

Huawei Instructions
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