how do I delete my Help Center?

how do I delete my Help Center?

I want to use Zoho Desk's email ticketing only. I'd rather not have an empty help center app hanging around the public web (at  https://desk.zoho.com/portal/xyz)

I've enabled the "NOINDEX and NOFOLLOW" option, but I don't see a way to just turn it off entirely the way I can turn off other features like Customer Happiness or Chat.

Where do I go to get rid of it completely?