This is in bottom left corner of a 55 inch LG QLED TV
View: https://imgur.com/gallery/Cp5Fwdr
View: https://imgur.com/gallery/Cp5Fwdr
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Is it there all the time?
Plus, I will add the question, what is the TV connected to and how?
Some monitor diagnostic result perhaps?
Check the monitor menus and default/set options.