Windows 10: A rectangular box showing on the left bottom of my pc

Hi,Sometimes a transparent rectangular box appearing on my pc and I can't select anything behind that transparent box.After I restart it will go.But I want to know if there are any solutions without restarting the system.

:)

 

Rectangular Box in Upper Left Corner

I believe I accidentally generated this rectangular (not square) box while I was learning about the Magnifier. This rectangular (7.5 cm X 4.3 cm) box causes whatever is located underneath it to be slightly whiter than it normally would be. Everything functions properly while 'inside' this box. I have tried to 'ungenerate' this box by manipulating Magnifier but to no avail. I have investigated several forums/BBs/KBs but found no solution to my problem. What investigative step do I take next to solve this problem?
Thank you.

Windows 10 PRO Insider Preview Evaluation copy. Build 14931.rs_prelease.160916-1700.

 

Rectangular Box in Upper Left Corner

@NurdBurd, I've just turned on Magnifier (1607 rtm) to see what you mean. Somewhere on the screen you should also find a 'magnifying glass' icon. Click on it and it will briefly become the control window for Magnifier.





After clicking on the magnifying glass, close it from here:

 

Cheap Photo box that will get the job done

WEll i took on this project for PP hes a hardware reviewer and wants to get the professional looking pics for the Pc parts

Materials:

• Big cardboard box

• a razor

• white material 3 yards

• cone lights

• stapler

• medical tape

• pvc pipe about 6 inches longer than your box

• white paint any cheap finger paint would work

the project I'm guessing will cost me $30 if it works out properly
I will post pictures and step by step as i do it