Facebook's Messenger or our Messages app is a good example of "Show over other apps". Under MIUI, this feature is called "Display Pop-up windows while running in the background.

In this case, the app on the Xiaomi smartphone has the authorization to show itself over other apps. In which form depends on the app itself. Apps can show themselves over other apps with a small pop-up, a video player, or as mentioned in the example, a round circle with profile photos of the individual Facebook chats.

Note: This permission is only visible when it is requested by an app.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Privacy protection
Step 3:  Tap on  Special permissions
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 Privacy protection
  3. Tap on Special permissions
  4. Tap on Display over other apps
  5. Choose an app
  6. Enable or disable Allow display over other apps

Xiaomi Instructions
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