You also have to set Top Topics as your homepage. Your homepage is set to the categories list. That’s because this theme setting only shows the pinboard lists and hides the content below. That only works on the top route. We can replace top topics with a pinboard list of top topics if needed. We typically need the categories list or latest topics for the forum to work.
You set the top page to be your home page by making it the first item of the top menu list in your admin settings:
