How to restrict not to display person number when searching a person to be the participant

Summary:

For the security issue, the company doesn't allow to display Participants' Person Number.
In serch for the participant to provide feedback, the searching result display the Person Name, Job and Person Number in the dropdown list.
Is there a way to restrict the searching result not to show the Person Number when searching in the Participant Feedback page?

Content (please ensure you mask any confidential information):

Employee is allowed to add participants to provide feedback to his/her performance document.

As the Participants are not in the same team as the appraisee, when employee is searching for the participant, the searching result is displaying the infomration of