Adding onto this: It would also be nice if it was easy to search in a communities list, and just filter the list there, instead of being redirected to the main search function.
I'm familiar with that, does it have the sorting options that OP and I are discussing? It looks to me like the sort order is both hard-coded and confusing, although less-popular communities do seem to be at the bottom... I can't identify any specific order that entries are listed in.
I'm new to the fediverse and as I was looking for new communities to subscribe to, I missed that feature as well. What I found more confusing is that the cursor actually changes to that "click me" finger when hovering over a column title like it would be able to sort. That's why I first thought, it isn't working only for me.
Searching through the github repo I found this issue of three days ago which asks for this feature. OP has given a work around there: You can filter for your instance and sort the communities at https://lemmyverse.net/communities