Facebook's Messenger is a good example of the "Draw over other apps" function. here, the app on the LG smartphone has the authorization to show itself on top of other apps. the form in which this is done depends on the app itself. apps can show themselves on top of other apps with a small pop-up, a video player or, as in the example, a round circle with profile photos of the individual chats.

By default, apps on the LG device are allowed to show themselves over others, but this can also be disabled.

Android 9 | LG UX 9.0
Step 1:  Open the  Settings
Step 2:  Tap on  General
Step 3:  Tap on  Apps & notifications
Step 4:  Tap on  Special access
Step 5:  Tap on  Draw over other apps
Step 6:  Tap on desired  App
Step 7:  Enable or Disable  Permit drawing over other apps
  1. Open the Settings
  2. Tap on General
  3. Tap on Apps & notifications
  4. Tap on Special access
  5. Tap on Draw over other apps
  6. Tap on desired App
  7. Enable or Disable Permit drawing over other apps

LG Instructions
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