Should I allow screen overlay on settings?
Screen overlays allow you to continue interacting with an app, no matter what else you're doing on your device. Without that capability, if you want to receive updates from that app, open it manually; apps that make visual tweaks to your phone won't work at all. However, a hacker could use a screen overlay maliciously.
What are overlay settings?
The Android overlay is a feature used by an app to appear on top of another app. Overlays are commonly used to display floating views such as the chat bubbles in Facebook Messenger or to display a temporary message or alert.
How do I turn off overlay settings?
A screen overlay is a part of an app that displays over other apps, such as the chat heads in Facebook Messenger. If you receive a screen overlay error, because an app is blocking part of another app on your screen, you can turn off screen overlays.
Why is there an overlay on my screen?
What is overlay effect?
What is turn off screen overlay?
How does overlay work?