Click "File | Page Setup" to open this page. You must have a project open in order to open this page.
Margins: Left, Right, Top, Bottom: Sets the page margins distances, in inches, for the reports. How close to the edge of the page the printer can print will depend on the printer. Set these values to be at least large enough to print within your printer's extents.
Set to Default: Sets each of the margin values to 0.5 inches.