From Carleton Moodle Docs
Course grade settings
Course grade settings determine how the gradebook appears for all participants in the course.
Grader report preferences
Teachers can set their preferences for the grader report via 'My preferences' These settings will apply to all courses for that teacher. The teacher may change them at any time.
For example it's possible to set the grader report to only show active participants or all participants (including suspended users) from the Show only active enrolments setting. Users may be suspended from the course by changing their status in Enrolled users>Edit enrolment. The user's role must not be removed when suspending the user or they will not show up in the grader report even if the "Show only active enrolments" option is set to "No."