When you’re inside a thread, all the way at the bottom the forums are listed (it’s called “Forum Jump”), but clicking the link to go to a new forum doesn’t work. I haven’t tried all of them, but the several I did try took me to a page that said “Oops! That page doesn’t exist or is private.”
What’s even worst is that failed page doesn’t have the normal stuff at the top right – your avatar and the three lines, especially.
So you’re sitting on a page with just a handful of ‘new’ posts and ‘suggested topics’ (or something like that, I forget exactly) and if you’re not interested in them, there is no obvious way to get to the topic list of a category.
(Yeah, yeah. Memorize the key shortcuts. I’m old and my brain is creaky.)