When you archive a class, we archive all class assignments. We also archive individual assignments for a student in that class if the student is no longer in any of your other active classes. If students in your archived class are still in any of your active classes, their individual assignments will not be automatically archived.
You can archive any remaining individual assignments. To archive an individual assignment, go to your active individual assignments page (https://commonlit.org/individual-assignments/in-progress) and click the folder icon for that individual assignment to archive it.
(On mobile devices, there are no icons. Click the three stacked dots in the corner of the assignment you want to archive; then click "Archive Assignment.)