The Users and Principals dialog provides a general overview of logins, roles, users, and schemas for a selected instance or database. The information on this dialog allows users to better classify and identify discovered instances. There are two different views on the Users and Principals dialog, the instance level view and the database level view.
Accessing the Users and Principals view.
There are two ways to access the Users and Principals view.
From the Instance Summary section
Select an instance and click View Instance Principals, this opens the Users and Principals dialog at the instance level view.
From the Database dialog
Select a database and click View Database Principals, this opens the Users and Principals dialog at the database level view.
For more information on the available views refer to these documents: