Create custom margins

  1. Click Page Layout - Margins.
  2. At the bottom, click Custom Margins.
  3. In the Page Setup box, enter new values for the margins.

Set the default margin 

  1. Click Page Layout - Margins.
  2. At the bottom, click Custom Margins.
  3. In the Page Setup box, enter new values for the margins.
  4. Click the Set As Default button.

Change the header and footer margin

  1. Click View - Ruler.
  2. Double-click the header or footer area.
  3. Press CTRL+A.
  4. On the ruler, drag the right indent marker.
  5. Drag the left indent marker.