Small white square appearing on screen

Yesterday I was looking at my iPhoto pictures and every picture had 2 small white squares appear on the screen which I tried to edit. Only to find this morning I now have one white square appearing on the Mac book pro screen. I cannot get rid of it.
Please can anyone advise me how to remove it and what is causing it?
Thanks
Carol

all makes perfect sense... except I cannot for the life of me find any reference in Apple docs to the tick mark box as being an on screen indicator of display mode  - you may have indeed found an anomaly though - look at the similarity to the tick boxes in this image from > Frequently asked questions about using a Retina display - Apple Support
I'm noticing functional or visual issues with an application. How can I make it work better?
Try opening the application using Low Resolution mode:
Quit the application if it is currently open.
etc........
This, I'm afraid, will remain one of Life's Great Mysteries... when troubleshooting, one thing at a time is imperative to detect that issue that is the fix.
Say "La Vee"
ÇÇÇ

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