If students accidentally submit their assignment too early, there is no need to "unsubmit". As long as the assignment has not been collected yet, students will be able to go into the assignment to revise.
From the 'My Assignments' page, click on the assignment.
Next, click 'Revise your work'.
Students will see a message that their work has been submitted already. Click on 'Revise now' in order to continue working on the assignment.
❗️Note: Students are unable to revise or redo multiple choice questions.