0.Open the Settings app.
1.Go to Apps.
2.Open Configure apps by touching the gear icon in the top-right corner.
3.In the Advanced section, open Draw over other apps.
4.Here you’ll have a drop-down menu from which you can view all the apps which have the permission to have an overlay by selecting Apps with permission.
5.You’ll have some apps with the permission as Yes.
6.Just touch on the app and change it’s permission to No using the slider.
Hope this fixes your problem.