To allow external users significant interaction with the community, which setting should be configured first?

To enable significant interaction for external users within a community, configuring site user visibility is essential. This setting determines how external users can access and interact with the community content. It influences what parts of the community are open to different user groups, ensuring that external users can fully engage with the features offered.

When site user visibility is properly configured, it ensures that external users have the necessary permissions to view and participate in discussions, access resources, and utilize the community's various functionalities. This foundational setting is critical in creating an inclusive environment where users outside the organization feel involved and are empowered to contribute.

The other options may contribute to user management and security configurations but are not as directly pertinent to enhancing external user interaction. For example, portal user visibility deals with broader portal access, while community settings focus on overall functionality and features. User permissions, while important for security, come into play after establishing how users will engage with the community. Thus, configuring site user visibility is a priority to facilitate the desired level of interaction.