Site User Visibility controls whether authenticated Experience Cloud users can discover other users who participate in the same site. Turning the setting off therefore affects searching for and seeing other external site users. The setting is part of the broader User-object sharing model, which is distinct from sharing business records such as Accounts, Cases, and Opportunities. It does not primarily control whether a user can edit the user ' s own profile, and it should not be interpreted as a general switch for internal-user search. Experience Cloud architects must treat user visibility as its own privacy problem because exposing the User directory can reveal names and other profile information even when business data is correctly isolated. The organization should therefore combine the User object ' s OWD and site/portal visibility settings with any required user- sharing rules according to the collaboration experience it intends to provide. Study Guide reference: Access to Other Data - User sharing, Site User Visibility, Experience Cloud user discovery, external-user privacy, and User-object access controls.