Secondary driver field is not editable in shipment's screen

Summary:

On the Shipment screen, we have a field called Secondary Driver which is not editable so can we make is editable or our user wants that field to be usable to them

Content (please ensure you mask any confidential information):

On the Shipment screen, we have a field called Secondary Driver which is not editable so can we make is editable or our user wants that field to be usable to them.

In Manager layout is not showing that field so do we need to add that field in Manager Layout and make it editable on the shipment creation page?