The feature is great, but its not properly optimized.
The feature lately received many negative reviews as the background app overlays often block the primary screen.
When this happens, you get a notification that reads Is Displaying Over Other Apps.

Heres how to deactivate the Is Displaying over other apps notification on Android Oreo.
Notice that you should not remove that popup notification and be very careful.
Once the notification arrives, long press on the notification, and you will enter the Android SystemNotification SettingsPanel.

This is where you could set up the preferences for this function.
Quickly make up the selection and, through there, block the function.
This will completely suspend the Is Displaying over other apps notification in Android oreo.

You must repeat the steps for every app notification you want to disable.
How to Hide Apps in Realme Phones
Google Chrome Not Saving Password?
8 Ways to Fix it
How To Fix Mobile Hotspot Connected but No Internet on Android


