The map composer menu will display. The New Map Composition dialog opens. Be sure that you have write permission in the directory where you are creating the new map. Type 7.5 and then press the Return key on your keyboard. Type 10.0 and then press the Return key on your keyboard.
Most printers have a small margin on all sides of a sheet that are unprintable.
This ensures that no part of the map occupies that unprintable area, and it leaves a nice margin around the edge of the composition. Click OK in the New Map Composition dialog. A blank Map Composer viewer displays along with the Annotation tool palette. There is also another menu of options, called the Quick View menu, that is available when you right-hold while your cursor is in the Map Composer viewer. The Annotation tools are available from the Viewer menu bar or from the Map Composer menu bar.