The class gradebook
The Gradebook rolls every student and every assignment into one grid - the class-wide view, instead of marking one submission at a time. Mark in Grades and it appears here automatically.
Select the class, then open Gradebook - every student down the rows, every assignment across the columns, the whole class marks at a glance.

See "Grading and feedback" for marking one submission at a time, the view that feeds this grid.