This may occur on other sites, but I notice it often on YouTube when I fullscreen a video. To make it disappear, I have to mouse over a link that changes the URL in the bottom left. If a video is in fullscreen, I have to exit fullscreen to do that.
This issue still occurs in safe mode.
v117.0 (64-bit)
Windows 11 v22H2 22621.2134
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.