In our Jira we are using a custom field Change implementer which is a user picker. When we try to select/choose an option in user picker custom field by default it is taking userid and its is getting displayed in the field. But for us it should display only Fullname(first name, last name). I am attaching a image for reference.
Eg- it should display Pawer, Mangesh or else is there any possibility to fetch the full name from the selected option instead of userid by using script.