Which feature is primarily associated with managing user roles in Salesforce?

The ability to manage user roles in Salesforce is primarily associated with the role hierarchy. The role hierarchy determines the levels of visibility and access that users have to data within the Salesforce environment. It allows organizations to establish a structured way to assign roles to users, thereby controlling data visibility based on each user's position in the hierarchy.

With a well-defined role hierarchy, users at higher levels can see the records owned by users at lower levels. This structure not only promotes data security but also enhances collaboration among team members by allowing appropriate access to information. For example, a manager can view the performance metrics of their direct reports, while those reports can only access their data. This clear segregation ensures that sensitive information is protected while enabling necessary access for effective teamwork.

The other options relate to different aspects of user management. Login Flows involve guiding users through a specific flow upon logging in, but they do not dictate roles or permissions. Auth. Providers are used for integrating external identity providers for authentication, which is separate from role management. Two-Step Verification adds an additional layer of security at the user login level, but it also does not relate to the management of user roles. Therefore, the role hierarchy is the correct choice for managing user roles effectively in Salesforce.