Read-Only Flow Document Containers
WPF provides three read-only containers that you can use to display flow documents:
FlowDocumentScrollViewer shows the entire document with a scroll bar to let you move through it if the document exceeds the size of the FlowDocumentScrollViewer. The FlowDocumentScrollViewer doesn't support pagination or multicolumn displays (although it does support printing and zooming, as all containers do). All of the examples you've seen up to this point have used the FlowDocumentScrollViewer.
FlowDocumentPageViewer splits a flow document into multiple pages. Each page is as large as the available space and the user can step from one page to the next. The FlowDocumentPageViewer has more overhead than the FlowDocumentScrollViewer ...