Some apps require the permission to show above other apps.
The best example is Facebook Messenger, when a new message is received, the profile picture of the chat partner is displayed and therefore shows up on other apps.
We can grant or revoke this permission for each individual app.

Android 10 | EMUI 10.0
Draw over other apps -  Open the  Settings
Draw over other apps -  Tap on  Apps
Draw over other apps -  Tap on  Apps
Draw over other apps -  Open the  menu
Draw over other apps -  Tap on  Special access
Draw over other apps -  Tap on  Draw over other apps
Draw over other apps -  Choose an  app
Draw over other apps -  Enable or disable  Draw over other apps
  1. Open the Settings
  2. Tap on Apps
  3. Tap on Apps
  4. Open the menu
  5. Tap on Special access
  6. Tap on Draw over other apps
  7. Choose an app
  8. Enable or disable Draw over other apps

Huawei Instructions
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