The results in the external grade column are shared with your institution as your students' grades for your course. You decide which column is set as the external grade. In new courses, the default total column is the default external grade column, and the External Grade icon appears in the column header. You can't delete the default total column until you set another column as the external grade.
In the Control Panel, click the two right arrows next to Grade Center.
Locate Current External Column
If you have not used an external column in the past, you will see a green check mark next to the column titled Total.