Manager Approving on Behalf of Direct Report in Approval Flow

We are facing an issue in our approval flow where the 4th approver (who is also the manager of the 5th approver) is able to approve a request on behalf of their direct report (5th approver). We would like to restrict this behavior and prevent the manager from approving the request twice.

Is there a configuration or setting within the approval flow to limit a manager's approval to only once, even if they are the manager of the next approver in the chain? Any guidance or solutions would be greatly appreciated.