Deleting categories, tags, accounts, etc. is not allowed in the Zevoy Hub since they could be tied to an expense or a claim. Instead, you can archive items and that will remove them from view, both in the App and Hub.
You have the possibility to bring back archived items under Settings and Archived. How to restore archived items:
Go to the Archived tab in settings.
Click on the item you would like to bring back.
Confirm the request and done!
Your restored item is now an active item in the App and Hub again.