This really hasn't changed much even when compared to much older versions than FMP 6.
Enter Layout mode
Use printer setup to select the printer, page size and orientation appropriate for how you will print the layout.
Open layout setup..., click the printing tab and check to see if margin settings are correct
Now look for the page break dashed line on your report and see what extends below the line. If the position of the line or look of the layout seems very different than the options you selected in Printer setup, you may have a corrupted layout that should be replaced.
If it looks about right, you can move the body up by making the header and/or any leading grand summary parts smaller or by reducing the height of the body by dragging the lower boundary of the body part up.