Screen Overlay Permissions
In order to turn off permissions of overlay apps, go to settings --> apps then click  the gear icon on the top right. Next under advanced, chose "Draw over other apps." Then you can turn off all the overlays you chose or tap "Enabled" in the top and switch it to "Disabled".






You can also uninstall the apps which are causing the overlay. For me, I had blue light filter installed and it didn't let me press allow since I had that on. Hope this helped!