6.50cm x 3.50cm screen has appeared top left corner of my screen on windows 11

[Windows 11]

hi guys,a 6.50cm x 3.50cm screen has appeared top left corner of my screen on windows 11 I performed a system restore but that hasn't fixed it.Hopefully someone else has had this problem and can help me fix it.I included a screen shot but the small screen didn't appear in the photo. whether that is significant, i don't know. Any help would be much appreciated.kind regards,Denis

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