Sometimes, instructors want to excuse a student from an individual assignment. You can excuse a student from an assignment, graded discussion, or quiz. You can also excuse a student from a group assignment. Excused assignments are not calculated as part of a student’s total grade.
When an assignment is excused, the assignment page and the student grade page will show the student that he or she has been excused from the assignment.
Students cannot submit excused assignments.
To excuse a student from an assignment, go to the GRADES area and type EX in the cell where you would normally type the grade. Then press the ENTER key.
For more information, see the Canvas documentation, located here: