Final Grade Override Column

The Final Grade Override feature adds a new column in your Gradebook that allows you to enter a final grade for students that is different from the grade automatically calculated by Canvas. 

To enable this feature in your course, go to Settings > Feature Options tab. Click the slider next to Final Grade Override to turn it on (green is on).

For more information read, How do I override a student's final grade in the New Gradebook? Links to an external site.