Hiding a Moodle activity or manually graded item within the Gradebook hides it from the student view in their Gradebook. If the activity is a Moodle activity, students can still access the activity on the course site, but it will not appear in their list of graded activities. A hidden activity/item is still visible to the instructor but the font color will be light grey.
The score of the hidden activity will not be counted in the gradebook total while the activity is hidden. You may choose to hide an activity in the Gradebook until the full class has completed it.
Note: Quizzes do not have a Hide option in the Gradebook. If you do not want students to see their grades, set the Review Option to Not release Grades in the Quiz settings.
Hiding an activity/item in the Gradebook in Moodle 3.2
Go to the course site home page.
Find the Administration block:
Click Gradebook setup.
Scroll to the grading item or category you want to hide
Click the Edit link for that item or activity.
Choose Hide from the menu. The font color for that item or category changes to light grey.
Click Save changes.
To unhide an activity in the Gradebook, repeat the steps above but choose Show from the Edit link menu. (Show and Hide are toggle commands; when one is in use, the other appears in the menu.)