Disabling or deactivate a plan

Hi,
we created a dev variant application to test the billing fragment.
We already created 2 plans with different prices and now we have a request from Nexi to keep only one plan at 0€/month but I cannot find how to disable the 2 existing plans with prices different from 0.

So, how can I disable a plan?

Thank you

Please send requests related to billing plans to devsupport@poynt.co