Wow, thank you for this explanation! You cleared up a mystery for me. I occasionally see a topic on the home page that looks interesting, and when I click on it to read or post, I see that it is in the “Catholic Living” category. Not Catholic Living > Family Life, or Catholic Living > Vocations, or an other subcategory, but just Catholic Living. But then later when I navigate to Catholic Living, I don’t see any topics, just the subcategories. So then I have trouble finding that topic that I had read or posted on before. I have to find some notification about it in my profile, or look up my post history, or find it on the home page. I began to think that maybe you need special permission to access the Catholic Living main category, and that that permission hadn’t been granted to my account. I never would have found the “none” option to make these topics display if you hadn’t pointed it out.
(In fact, when I click on the Catholic Living tab, there is bold text right there on the page saying “There are no more Catholic Living topics.” That’s why I had thought I needed special permission to access topics in this category, which I didn’t have.)