Strange blue square box roaming around my screen
I wonder if I accidentally reset a setting or I have been hacked with a virus on my iPhone 7 + This blue box that is rectangular now roams around my screen and temporarily encircles the icons search bar and so-forth . Is this an Iphone feature? If it is it is annoying and useless. Can’t figure out how to disable. Any ideas?
iPhone 7 Plus, 12