Windows 10: Does anyone know what that black box is on upper left of my screen and how i get rid of it.

Help how do I get rid of that little black box with the sun in it on the upper right of screen.

:)

 

How do I get rid of the mini screen at the upper left of my monitor?

How do I get rid of the mini screen in the upper left of monitor?

 

Flashing black box in upper left corner

Immediately after upgrading to Windows 10 I have experienced the appearance of a flashing black box in the upper left corner of the screen. It seems to appear about once to several times a minute and is extremely annoying to the point I 'm considering
going back to Windows 8.1. It flashes on and off quickly. The Microsoft representative told me to be patient and he assured me there will be an update soon to correct these bugs. Has anyone else experienced this momentary flashing black box in the upper left
corner which appears regardless of what I'm doing? Also can't enable screen saver since Windows 10 download?

 

how can I get rid of the small square n the left hand upper cornerof my screen

How can I get rid of the small square in the left hand upper corner of my screen