Problem with Huawei mate 10?

Hey, yesterday was full of stress and ran with still set mobile phone screen to the car. Arriving by car, of course, thousands of Fenszer was open on the phone. Later, I found that at once this mini touchpad (That's what I call it now) there. I do not know how to get it off. Somehow I have not figured out what I can use it for. It's always there except when I take pictures or open playapps. I can move it back and forth and or just move the gray box. Do you know that and know how it goes?

PS image was created by taking a picture of the screen

Read it here.

https://www.android-hilfe.de/...60931.html

Thank you 😊