How can I configure the software to remove the "Close" button for technicians?

We cannot allow that technicians close their requests. If a request is solved, they must change it to "resolved" and then the cliente receive the email and close the request or re-open it.

We know some technicians will change the status to "Resolved" but others will change to "close", and without the client permission.

To solve this, we need to disable the "Close" button and option for them.

Thanks in advance for your help.

Raul Aroso