I had this same STUPID popup in Bing search. It's like I can't do anything without changing this "Screen Overlay" setting (which doesn't exist)... and when it takes me to the settings, nothing I do gets rid of that popup. I'll work on it and see if I can find a fix for us.
EDIT: Okay, it's complicated but there is a fix that might work.This is a problem that has surfaced with the latest Android Marshmallow update. This issue has been affecting many apps, and it derives from Google's new permission management protocol. So basically Google screwed this up. Anyway, here is a potential fix:<a href='
https://www.androidpit.com/how-to-fix-screen-overlay-detected-error' target='_blank' class='externalLink'>
https://www.androidpit.com/how-to-fix-screen-overlay-detected-error</a>Let's hope this works until Google gets this resolved!