The Huawei device suggests, which app have not been optimized for full-screen mode. You can still activate the function and set the setting for each of these apps individually.

Android 10 | EMUI 10.0
Full-Screen Display -  Open the  settings
Full-Screen Display -  Tap on  Display & brightness
Full-Screen Display -  Tap on  More display settings
Full-Screen Display -  Tap on  Full-Screen Display
Full-Screen Display -  Activate or deactivate the  app
  1. Open the settings
  2. Tap on Display & brightness
  3. Tap on More display settings
  4. Tap on Full-Screen Display
  5. Activate or deactivate the app

Huawei Instructions
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