I teach at a community college. When a student withdraws from a class, the student loses access to the Canvas course. In addition, I no longer see the student's profile, assignments, or grades.

However, if a student is reinstated to the course, then both I and the student will see the work that that he or she submitted before the student had withdrawn.

At the end of the semester, all of my students will lose access to my Canvas course, including their assignments. The course will become "read only" for me, as the instructor.