Action dropdown selections for Incidents of Customer Service Portal

[Bret Smith]

would like to not allow customers to reopen Closed Incidents from the Customer Portal

where can I go to remove 'reopen' selection from the action button for "Closed" Incidents?

[Bret Smith]

More clarification....

We need to allow customers to reopen or close an Incident ticket in 'Resolved' status
BUT 
Do NOT want the customer to be able to reopen an Incident ticket in 'Closed' status