Sometimes when entering and managing Grades, you may want to hide columns. Hiding columns allows you to focus on what you are doing at that moment.
On the course home page, in the navbar, click Grades.
In the Enter Grades area, click on the More Actions dropdown menu.
From the dropdown menu select the Hide/Show Columns option.
When the window opens with your columns listed, select / deselect your desired columns, then click save.