Please, do not use your Enter key on your keyboard to double space your document. Here is an easier, better way.
To double space, select (highlight) what you want to double space, click on the down arrow of the Line Spacing button on the Formatting Tool Bar.
From
the drop down menu select 2.0
Tip: Don’t double space your text until you're ready to print. Single spacing allows you to see more lines on the screen.