How to restrict users from reopening request once it is set to 'Resolved'?

Summary:

We want restrict employee from reopening the request once it is set to 'Resolved'. I have added an expression on status field in
Edit HRHD Emp Flow, Edit HRHD Agent Flow, HRHD Detail Agent Flow , HRHD Detail Emp Flow

When employee who is also an Agent goes to myhelp, status field is readonly when it is set to Resolved.

But when employee goes to HR Requests page and edit the same request, status field is editable. After this, if the employee goes back to myhelp page, the status field is editable.

How can I restrict any employee from reopening the request if it is set to 'Resolved'?