iOS 13 iPhone 11 pro. Grade school son has figured out that at anytime, even while phone is locked, he can grab the phone and take a screenshot (vol-up + power). Over and over again (repeat...). Also if the thumbnail of the snapshot is touched the photo editor app opens up and then he can (and does) scribble and draw things on the photo. My photos app is filling up with these creative masterpieces. Since various disciplinary actions that come to mind are out of vogue now can this 'feature' be turned off?