team2121 lost the main page icons/categories

Without changing any settings, the main page content vanished.

Lately, only Events plugin has been tweaked, and only at subcategories level.

I am getting the old view only from this link:

Fixed it for you. Probably a caching delayed effect of me trying to fix the Calendar / Agenda menu item two days ago. Sorry about that.

If that happens ever again, here’s how the frontpage content is configured in Discourse: the first item mentioned in setting “top menu” defined what is seen on the frontpage. In your case, you want to put “Categories” there, like it is again now.