It's kind of fiddly, yeah, I'm probably just so used to working with it.
I don't use the Quick Topics at all. Sadly. I found what I needed for organisation with the Bookmarking.
Perhaps in the settings you need to turn them on still?
Quick Topics might be the better way to go. I have numerous group games but say you want just all the threads for that one group game in one menu, Quick Topics may be the way to go for you.
It's one of the great things about what Ssieth has done, it can be used just how you need it to when you need it. :)
So they need to be turned on as well.

It will add the Quick Topics to the menu bar.

Within a thread you will see the Add QT button is there.

Now you have specified threads in the QT drop-down menu above

I hope that helps, Sith.