Bulleted numbers appear vertically

Mac OS 10.15.6 MacBook Air. Strange number listing appears. Any ideas of cause?


What were you doing when this appeared? Can you reproduce it?

I notice you snapped the image with a camera – can it not be captured with a screenshot?

looks like some accessibility feature, like putting a number on the side of each “File” menu element.

Just a guess, not many info to work with =)