a black box suddenly appeared and i can't remove it.

[Wadea Ezmirly]

a transparent black box suddenly appeared when I accidently pressed some keys on the keyboard, and I don't know how to remove it, can someone help me please. I tried closing all of the apps, I restarted the pc, and I tried updating the drivers, and I'm sure it's not from the monitor cause I have it on both of my monitors and when I screenshot it, it doesn't appear in the screenshot.

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