I noticed this overlay problem today:
Not well as it is relative to the page. Might be stuck in Image moderation right now?
My browser is at 100%. I just figured that the drop-down should hover over the logo rather than go under it. It only happens when you've scrolled down to the end of a thread anyway, so it isn't a big deal.
@Anne LoForte Willson
Just in passing ...
I had never, scrolled down, to the bottom, on a page/screen, when I had that "Notifications" List, dropped down.
That Said ...
I just checked; and, tested, in the "Browsers" of:
(1) 'Google' "Chrome"; and,
(2) 'Mozilla' "FireFox"; and,
(3) 'Microsoft' "Edge"
All, working on the "Operating System" of 'Microsoft' "Windows 10".
And, all, with the LATEST "version".
'Yes' ... Same, same ...
Good pick-up ...
The "Zoom" of my "Browsers" was at 100%.
[ Plus, I 'Fiddled' around with such ... ]
And, the "Resolution", of my Screen/Monitor, was that which is "Recommended"; and, certainly NOT the "Lowest" setting.
Plus, I checked, the VARIOUS Settings of my, "Personalization"; and, 'Magnifier'/Scaling ... ALL is GOOD there.
[ ie. NO problem/issue in that respect ... ]
As such ...
The problem/issue that you have found/described/shown, appears to be a Fault/Flaw, of the, 'Out-of-the-Box', bought, "Vanilla" Platform, that the "Community.FamilySearch" Forum, now operates upon; and, has had some customisation (ie. "Tweaking") of done, for the purposes of the Forum.
From my perspective ...
Certainly not something, that needs any time and effort wasted upon, trying to address/fix.
Just a very minor thing, I can certainly ignore.
Just my thoughts.