Making it one topic
I've installed wpforo and set it up
Currently I have the following layout: main category > sub category (with the link as website.com/community/forum)
Is it possible to have just a single topic, without a main category?
It would ideally be: Forum (with the link as website.com/forum)
This would then be similar to a subreddit, as I don't need a fully fledged forum with multiple topics
You can create a new page and use a forum shortcode to list all topics of a one forum (don't remove the main /community/ page).
[wpforo item="forum" id="2"] – Loads ID = 2 forum page. On this page you can see all subForums and list of all Topics.
I'm sorry but there is no way.