this seems to have been recently introduced, started seeing this about a month ago. Also not sure what triggers it exactly unfortunately :/
this post was submitted on 10 Sep 2023
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Try scrolling up in full screen mode. On my mac, I can do that and then move the cursor over one of the other videos and then the url will go away.
I've noticed this for about 6 months or so, particularly on full screen videos
I have this too, when I switch tabs (and back again) it's gone.
Reach out to YouTube to report the issue.