I don't think the XenForo people understand "navigation bars" at all.
Example: Here's this thread if you're at the top...
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You can get around almost everything on the site, using these buttons up here.
Now you scroll down a bit and they pop up this bar... at the top of your screen, and it floats there all the while you're scrolling down the thread...
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Note how almost NOTHING that was on the navigation portion of the screen migrates to the floating bar? Not even "News and Management" and "Site Feedback and Support", which were on the original nav bar?
The whole "Mark Forums Read" ... "New Posts" bar is just gone after you scroll down.
I think they were trying to "de-clutter" things as you scrolled down into the thread, but they forgot to bring along the other nav functions from even the original bar at the top.
I also don't "get" the top right buttons. "Home" is duplicated which is already in what I'm calling the "nav bar", as is "Forums" and both survive the scroll in it to when it swiches to a floater. "Members" is only available top-right, and not on the non-scrolled nav-bar, but appears magically in the scrolled one. As do the icons... but NOT the "hamburger" (as Mari dubbed it... the blue stack box directly under the other four right top icons).
And why label the three buttons top right with text, but have to mouse-over the four other icons?
Strangely disjointed.
Now scroll all the way to the bottom... hey wait, the original non-floating nav-bar is there... but there's a floating nav-bar at the top still... wasn't it supposed to replace the top one?
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And more icons in the bottom right that start interestingly... a "Contact Us"... but we had "Site Feedback and Support" at the top and to the left on the non-floating nav-bars, and interestingly they don't go to the same URL...
Then "Help" ... wait, what? We haven't seen that one before have we? That's the first use of "Help" and it goes to yet another page that explains BBCODE and stuff... but there's no "Help" anywhere else on the page...
And then another House icon, for Home... we're up to four of those...
And then a whole new concept / nav-thingy... an up-arrow for "Top". Wait, why isn't there a down-arrow thingy at the top of the page for "Bottom"?? Why only a "top", and crammed over into a corner...
Then the icon mostly used for WiFi or radio, re-used to mean... RSS feed? Okay I guess that's the RSS feed icon, but that's the only place they put it? Bottom right of every thread? And it takes you to an RSS feed for the WHOLE site...
And the hamburger makes a comeback, here at the bottom too.
It kinda looks like the XF folks must enjoy their Adderall, maybe... or they just like being confusing. I dunno. Not to worry, it's common for web designers to just slap crap all over the screen and think it looks good or makes sense... but this is why I hate web interfaces. If you're going to bother writing a floating bar... JUST PUT EVERYTHING ON THE BAR AND THAT KEEPS IT OUT OF THE WAY!
Web devs...
Oh hahaha there's another funny one I see after opening up the smilies button, but I can guess as to why on the back-end...
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Design-wise, y'all do realize that nobody cares in the slightest what KIND of smilies they are, right? In two years, what will "Legacy PoA" be? Heh... But...
I bet y'all did that because you didn't want to pollute the XF directory (in case of future upgrades) with files/filenames that might get overwritten? (Or there were file name conflicts already?) Just a guess... but do think about UI / UX... nobody cares what kind of Smilies (or what century they came from) they are... (GRIN!)
I get it though... that one is probably a sysadmin "Ah, ****!... They didn't provide a directory to put add-on smilies in... and we're going to have a namespace clash..."!
Anyway... navigation bars are definitely quite strange. They just kinda throw the icons around and/or the Text Buttons (they're not consistent on whether they use text, icon plus text, or just icon either) in the corners and top and bottom of a thread page, and then have this odd floating bar show up just to float along with ya, too... like they can't make up their minds on how they want the user to do site nav.