Tap it and you must see the screenshot animation flash, followed by said screenshot hovering within the prime-right corner for a few seconds.
How do I turn off screenshots?
Begin by heading over to the screen or app on your Android that you want to take a screen of. To trigger the Now on Tap screen ( a feature that allows button-less screenshot) press and hold the home button. Once you see the Now on Tap screen slide up from the bottom, let go of the home button on your Android device.