[Koha] running reports

When I run/print reports, the entries/page are limited to 20. Most of my reports are lists of books checked out by a particular class and I'd like to have it all on one page for the teacher. When I go to Saved Reports, I can change the entries/page for the number of reports shown, but after running a particular report, only 20 entries will show, with a second page for the others. This is the case both on screen and in the printed report. I can't find anywhere to change the entries/page for report results. Any ideas? Thanks, Shelley Kemperman