How do I hide a grade centre column? (Staff)

Click on Gradebook and make sure that you are in Grid View

Click on the column you want to hide

Click on Edit

Select Hidden from Students from the dropdown menu. You can also use Release Conditions to make the column available at a specific time and date.

If you have set up an Overall Mark, you can choose whether to show it to students when you set it up. You can change this at any time:

Click on Overall Mark 

Click on Edit

Use the Show to students tick box to control visibility