You can view SPF reports in a number of different sizes. Changing the size has no effect on the report itself or how it prints.
Reports in Production Reporting Viewer initially display at 100%. You can change the size from the View menu by selecting 25%, 50%, 75%, 100%, or 150%. If you select Full Page, each page fully displays on the screen. You can also select Zoom In or Zoom Out to increase or decrease the size.