To allow external members of the same account to see each other, what action is necessary?

To enable external members of the same account to see each other, it is necessary to deselect Site User Visibility and select Portal User Visibility. This configuration is critical in a community or portal scenario where external users need to interact and see each other's profiles or content.

By selecting Portal User Visibility, you allow users who are defined as "Portal Users" to access the shared resources and see others within the same portal. This setting facilitates interaction among external members, allowing them to collaborate and communicate effectively. In contrast, Site User Visibility typically pertains to internal users or those who are supposed to have limited access to external member interactions, thus it is important to deselect it to avoid restrictions.

This combination of enabling portal visibility while disabling site visibility establishes the necessary environment for external users to connect, share, and engage with one another within the same account.