Zoho Mail Contacts - How to delete a category?

Zoho Mail Contacts - How to delete a category?

Fortunately, all my Contacts are showing again in the Old Version.

But - I don't see how I can delete a contact category that is no longer needed  or, as in this case, is a duplicate category?

I can manage a category (add contacts, delete, clear all, etc.) but I cannot delete the category.

Does anybody know?

Thanks.

Margeaux