Windows 10: white rectangle on top left corner of screen

so there is a solid white rectangle on the top left corner of my screen.if i open another window and close it nothing happens it works normally. the square doesnt come on any app just remains on the dektop. the square remains on the top left corner and now i cant evn click it but i can move it if i can hold the top part of the white box. I've been searching for what it is exactly.. but i didn't find solutions on the internet. Finally i checked with my revo uninstaller hunter mode, and i found out that it's a svchost.exe file running. I've tried going through process explorer and

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White rectangle on top left corner of screen

so there is a solid white rectangle on the top left corner of my screen.

if i open another window and close it nothing happens it works normally. the square doesnt come on any app just remains on the dektop.

the square remains on the top left corner and now i cant evn click it but i can move it if i can hold the top part of the white box.

I've been searching for what it is exactly.. but i didn't find solutions on the internet. Finally i checked with my revo uninstaller hunter mode, and i found out that it's a svchost.exe file running. I've tried going through process explorer and other stuff.. but nothing came out fruitful.. later, i headed to services and started to end all the services that were running by svchost.exe

and later i found out that CaptureService_393a7 was the culprit here.
I ended that service and was able to eliminate that white box. I wanted to know what is the use of CaptureService_393a7?
that was the only thing that was causing that white box on my desktop.
and when i press windows+D that white box disappears. But when i open a windowed program, it comes back.

Could anyone help me figure out this issue and how to i stop it from causing such things?

This is potentially a solution to this question:

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White Rectangle

I had a white rectangle show up in the top left hand corner of my desktop. It was quite annoying. I tried changing the wallpaper, and killing a few programs in task manager. In the end I restarted windows explorer and that fixed it. Some people killed
other programs but those threads are locked. Hope it helped!

 

Transparent square on top left corner of screen after Windows update

Good day! I'm Raniel, an Independent Advisor and a Microsoft user like you.

I found an article with a similar issue that you're experiencing with the transparent square. Kindly follow the steps provided by Greg Carmack - Windows MVP 2010-20 and see if it works for you:

https://answers.microsoft.com/en-us/windows/for...

I hope this helps.