How do admins manage the ability to modify the From email in Case replies?

Admins can manage whether users can change the From email when replying to a Case by enabling or disabling the Override From Email ID checkbox in Profile Settings > Cases > Tools. If this setting is disabled, users are restricted to using the default Help desk email ID, and the option to select an alternative email will not be available. However, users can choose from multiple configured Help desk email IDs when responding to Cases if enabled.