Select a group by data field in the Group By box (1).

To force a new page before the new group is displayed select New Page After Group (2).

In this example overdue items are grouped by student.

Loaned out items for one student are displayed on a separate page.

In this example book items are grouped by series.

Books that belong to one series are displayed on a separate page.

Questions:
How to print overdue items report by teacher (class)? Overdue items by class, grade, teacher, print groups on separate pages; those reports are sent to classes.