Make sure that you are not printing from a layout that is in form view. What you show appears to be table view and printing while in that view should not give you one record to a page. Perhaps you are using a script to print instead of just selecting print from the File menu?
Thanks for your reply. I have managed to sort out by doing the following:
Layouts /Part Set Up/Sub-summary when sorted by/change/allow part to break across page boundaries