When you select a job and click the edit button 
the realistic preview is displayed.
The preview opens in sheet view. The front and the back side of the document sheets are displayed.
Sheet viewClick 
to go to the document view. The document view shows two opposite pages.
Document view Click 
to display the scroll bar.
Use the scroll bar or swipe to go to another page in the same view.
Document viewClick 
to display a scroll bar to zoom into a detail of a page. Click again to hide the scroll bar.
Zoom into detail