In some cases, instructors may wish to hold student grades until all assignments have been graded, and then release grades to all students at the same time. To hide student grades temporarily, an instructor can choose to mark an assignment as "muted". Students can still see and submit a muted assignment. Only the grade will be hidden.
Please note that muted assignments in the grade book may cause problems when importing the Canvas total score. The scores for muted assignments are not included in the calculation of the imported score, although the total score looks correct in the grade book.
Learn more about the muting and unmuting assignments here.