A better explanation - the menu hamburger dropdown, upper right of the page, used to show all the categories (Factual Questions, IMHO etc.). Very simple and very handy for navigation. No matter where you where in a thread, you could pop over to a different category.
That ‘hamburger’ drop down menu is still there, but missing the quick short cut to all categories. All the categories used to be listed on the drop down. This happened a few days ago.
There is an all categories link that takes you all the way back to the front page. I’ve tried to change it back, but it won’t do it. I never changed anything in the first place.
Is this a Discourse change?