From Carleton Moodle Docs
Single view allows a course teacher to view either all the grades of one single student (1 below) or a single grade item for all students (2 below):
When editing a grade or feedback, you can press tab to go to the next row below.
Single view may also be accessed from Course>Grade administration>Single view, from where the teacher is presented with a dropdown menu to select either a grade item or a student.
Grades may be excluded, or overridden and modified. It is also possible to bulk insert a grade, which might be useful for example if you wish to give the grade 0 to all students who did not submit work.