[GUIDE] Remove categories

I'm running in circles for hours now with this Guide problem. I simply cannot remove a category from my Help Center.

All solutions I found so far in the internet or Zendesk community point to buttons I don't have anywhere. I'm the account Owner/Admin so I don't understand why I can't do anything. I can create new Categories but can't delete. Within the HC preview there is also not an option while going in or out the categories. 

This is really getting on my nerves, as the HELP CENTER of the Zendesk HC is being useless (giving useless solutions).