@awesomerobot Thank you for the response! That makes sense that those are custom themes. I’m actually trying to develop a custom remote theme as well.
Per your recommendation, I actually have Boxes with Subcategories selected under Admin > Settings. From what I can see though, that just sets up the Category Boxes Handlebar Template for the route /categories.
The issue I’m facing is trying to get what is viewed /categories (the Category Boxes) onto the my Discourse homepage (so /).