The Specific User source loads fields from a manually selected user account.
After selecting the source, you can choose a specific user from the available user list. The field picker will then show only fields attached to users.

This source is useful for:
- featured author boxes,
- team member sections,
- contributor highlights,
- staff directories,
- or reusable profile layouts.
Unlike Current User, the selected user remains fixed regardless of the page or template being viewed.