Which antivirus do you have installed?Also worth noting that my S8+ has same A/V and is not affected
Which antivirus do you have installed?
Malwarebytes is a respected antivirus and, in theory, shouldn't be the cause for that popup. Try the steps included in the guide a linked above and tell us how it goes.Malwarebytes (subscription) - its on both the S9+ and the S8+ ...
......no such overlay on the S8+
Try this, settings - apps - three dots top right - tap special access - 'appear on top'.
Take a look which apps have that permission enabled and you can post a screenshot here if you want.good suggestion - S9+ its called "draw over other apps"