The default line spacing in Word is 1.15. By default, paragraphs are followed by a blank line and headings have a space above them. Here’s how to change the default settings.
On the Home tab, click Line and Paragraph Spacing.
Click Line Spacing Options at the bottom of the menu, and then select the options you want in the Paragraph dialog box under Spacing.
If you want to change the spacing before or after the selected paragraphs, click the arrow next to Before or After and enter the amount of space that you want.