If a student is no longer in your class, you can remove them from appearing in your roster in Markboard and Attendance by unenrolling them in Chalk. This article goes over how to do this.
Navigate to the Students page in Markboard through the menu at the top of the page, as shown below.
Note: Student management for the Attendance app is done through Markboard as well.
Select the class you want to edit the student roster for from the drop-down menu in the top-left corner.
Click the Unenroll button to the right of the student you wish to remove from this class.
Check the boxes for the warning notifications about unenrolling the student. Please note that removing them from this class will delete any assessment or attendance data for this student in Chalk. Click Yes, Unenroll to remove the student.