There are apps installed on the OnePlus smartphone that will sooner or later request permission to appear or show over other apps.

A very fitting example is the Facebook Messenger app, which displays the profile photo of the chat partner at the edge of the screen when a new message is received in a conversation or chat.

Android 10 (OxygenOS 10.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Apps & notifications
Step 3:  Tap on  Special app access
Step 4:  Tap on  Display over other apps
Step 5:  Choose an  app
Step 6:  Enable or disable  Allow display over other apps
  1. Open the Settings
  2. Tap on Apps & notifications
  3. Tap on Special app access
  4. Tap on Display over other apps
  5. Choose an app
  6. Enable or disable Allow display over other apps

OnePlus Instructions
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