Hello Janeal,
The "active/inactive" status has nothing to do with how much a student has participated in the class. Rather, it's the status of their enrollment.
Typically, if Canvas enrollments are automatically updated of official enrollment information in the Student Information System, the school will set an enrollment to be "inactive" if a student has dropped the class. Once a student's enrollment is marked "inactive", they will no longer have access to the course.
The school could also "delete" the enrollment, but that takes the student out of the roster, gradebook, etc., whereas "inactive" allows the instructor to see what the student did even after they have dropped, which can be important for things like financial aid reporting.
Mike
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