Tirso
This Forum is for the open-source product. Since you are using the cloud-hosted version you can contact us directly through our website, email, or phone number and we can further assist you.
Since we are already here, I will go ahead and say that you can create a "closed" Department and only give the supervisor access to it. Then have Agents Refer the Tickets to the "closed" Department before closing and then the supervisor will only see the closed Tickets.
Cheers.