Moodle's default is to display the Course Total as a numeric grade based on a percentage. You may wish to display this as a letter grade or both.
To change the display type click on Grades under the Settings Block.
This will take you into the Grader Report. Click Turn Editing On in the top right corner.
You will notice many icons in your grade sheet. Under your course title click on the gear icon to take you into the Course Total settings.
In the Course Total Settings, at the very bottom click on Show More.
Click the dropdown list under Grade Display Type then choose the display setting you desire. For example: Letter.
Click Save Changes at the bottom.
NOTE: You must Turn Editing Off in oder to see the change in the Grade Display.