How to make the field "Name" in the "Requester Details" inactive

How to make the field "Name" in the "Requester Details" inactive

How to prevent   make   nonsense   in the   "Name" in the "Requester Details"   and   allow  only the names   of the Active  D irectory?   For example, how   to make this field  inactive , allowing the   selection   of   only the   Active Directory ?   Thank you.


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