In Salesforce Public Sector Solutions, to ensure that constituents (external users) cannot see each other by default on the new site, the sharing settings must be appropriately configured. Specifically, the 'Site User Visibility' setting is designed to control whether users can see each other within the site. Here’s how to configure it:

Navigate to Sharing Settings:

Go to Setup > Security > Sharing Settings.

Uncheck Site User Visibility:

Locate the 'Site User Visibility' checkbox within the sharing settings.

Uncheck this box. This setting ensures that site users (constituents) cannot see each other's profiles and details by default.

By unchecking the 'Site User Visibility' checkbox, the PSO ensures that user records are private and not visible to other users on the site. This is a critical setting for maintaining privacy and security for constituents interacting with the PSO's site.