Click on Table Properties. After clicking on Table Properties the following screen should appear. Select the Table tab and go to the area highlighted below. Click on the drop box beside Table Width. . To make the table as wide as the viewing screen, select from the drop box.
Pixels are like inches because they both measure length in increments.
Next, adjust the numerical value beside Table Width to 600. Because of the computers resolution, when the pixels are set at 600 the table will be the width of the viewing screen for the most common computer settings. See area below. . Click on . Your table should now span across the viewing screen like the one below.