How to get rid of the black outline that appears when selecting a file or a folder

[Sarath Simha]

A black outline appears when I select a file or folder in file explorer. It started all of a sudden and it's irritating me now. Even after I click on the empty space, the black border still remains active around the file/folder. Checked out the accessibility settings but couldn't find any solution.Tried uploading the screenshot to this problem but upload keeps failing. Somebody please help me with a solution to this.

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