Screen Overlay is one facility on Android to have some app hovering over all apps so that user can quickly access the app anytime.
One thing Google never tell you is that once an app is run with Screen Overlay, You cannot turn on Screen Overlay mode. To turn on or off you need to go to to Settings then click on the wheel on top left of the screen then choose "Draw over other apps" after that slide on "Permit drawing over other apps". The selection is greyed out.
The only way to enable the "Permit drawing over other apps" setting is to completely close the app that does Screen Overlay then make the changes before enabling the Screen Overlay app again.
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