Once a student has turned in an assignment you can either return the assignment to the student or mark it as complete.
Mark as complete
You can mark an assignment as complete by selecting a Progress Action while in student view.
Mark as Complete cannot be undone. Once an assignment is marked as complete it becomes Read Only for the student and no further changes can be made.
Return to student
You can return a turned in assignment to your student by selecting a Progress Action while in student view.
If you'd like a student to makes changes to their assignment, you can mark it as Return to Student. This will change the status of the assignment from Turned In to In Progress.