To be able to flow across pages the root subform (probably Page1) must be set to flowed and not positioned. But if you set it to flowed all child nodes will be left justifed and placed top to bottom. So before you change the setting make sure that you group together sections of the form that need to stay
together in a positioned subform that will be the width of the page. Once that is done then set the Page1 subform to flowed and try it. There is a good example of this structure in the samples that designer ships with. Have a look at the dynamic interactive purchase order.
Hope that helps
Paul