By default the Course Site gradebook shows the "Real" grade type. Which is simply the raw points the student currently has accumulated. To show a different grade type (i.e., Grade, Percentage, etc) the grade type needs to be changed.
Go to Grades>Course grade Settings
Next, Go to the "Grade item settings" and change the Grade Display type to your preference. Make sure to scroll down and click "Save Changes".
Change only the total grade display type, not all grades
Go to Gradebook Set-up
Top Folder Level (course name)> Edit> Edit settings> Category Total > Show More> Grade Display Type
For more information about Grade Display Types, please visit the official Moodle 4.1 Documentation
...