It keeps show me this screen. How can I cancel it?
This looks like the lockscreen that is used when you have a compatible flip-cover case which has a small window in the part covering the screen.
I believe this screen is triggered by a magnet in the flip-cover case. If you play around with a magnet around the phone, you can actually make this screen appear.
Do you use some case which has some metal/magnet? This could trigger the screen.