IAM User is the entity that handles the real authentication for IFS Cloud. IAM User Detail page lists all the IFS Users that are synchronized to IFS IAM. IFS User's DIRECTORY_ID is equal to the username in here. This is only to view the users created/synchronized automatically and no user can be created from this page.
Unlock User: Allow administrators to unlock users if necessary. E.g. When a user got locked due to a Brute force attack. (use of incorrect password) .
Delete User: Allow administrators to delete IAM Users. Deleting an IAM user will not delete the IFS User. After deleting, users can login again as the first time login attempt.
This feature comes in handy when a user gets created incorrectly due to incorrect External IDP configuration.