The Roster feature in Blackboard Learn’s Ultra Course View provides instructors with a comprehensive view of their course participants.
Click on View everyone in your course to check the course's roster.

Once accessed, you'll see the students' names, roles, accommodations (if any), and the option to filter the course members you want to see.
If you click on a student's name, you'll access their grading information.

For more detailed information, visit the Blackboard Learn Help page for Instructors or simply click here.