Managing Gradebook Items
In addition to the columns that are automatically added to the Gradebook
when you add an Assignment, a Test, or a Survey to the course, you
may add item columns manually.

You are able to shuffle the order of the columns as they appear
to both you and your students. Managing the items also includes the
ability to Remove items that you have manually added. Note that any
item that does not have a Remove button is a Test, Assignment
or Survey that receives auto columns.