Once a date/time is set for due date can students still view the work they handed in or is it locked completely? Also when the due date/time is set and a student tries to submit the work, can this happen?
@AB21805 Students can view the work they have handed in but it is read-only. Once you've marked the work, when you click "Return" this makes it editable to the student again.
When creating the assignment, if you click on "Assignment will be posted immediately (....) Edit" underneath the Due date you can add a Close date. With a close date set the students are unable to hand work in after this date. The default is no close date, which will allow late hand-ins.