I am an instructor.

I have two separate issues with completed and graded assignments showing in the to-do list and showing as not crossed out in the student calendar. One type of assignment had no submission as it was completed in Microsoft Forms. The assignment has received a grade in Canvas. The other assignment had a submission and has been grade but is still showing in the to-do list and is not crossed out on the student calendar.

How can I help my students see that their work has been completed? It is frustrating for them thinking their work is not done.