The Service Cloud User feature license entitles users to additional Salesforce features, such as the Service Console.
Reference Article:
https://help.salesforce.com/s/articleView?id=sf.console2_assign_service_feature_license.htm&type=5
To assign the Service Cloud User feature license to users, “Manage Internal Users” permission is required.
To find users with Service Cloud User check box checked or enabled in Salesforce: