@mirage_gsm The discussion topics are USUALLY created when the first part goes up, by whoever is posting the volume. Occasionally not (only saw it once myself). They determine where THEY think the "appropriate section" is.
The thing about looking for them is that sometimes they fall far off the first page of "Recent", because there may be no activity for a few days (weeks?). And we have how many active volumes right now? A lot.
For me, it's sometimes faster to go find the link Rahul illustrated.