Have too much space between the lines of your document? Use the Line Spacing button on the Home tab to make it look the way you want:
Click Edit Document > Edit in Word Online if you haven’t already.
Click anywhere in the paragraph you want to change, or press Ctrl+A to select all text.
Click Home > Line Spacing.
Select the number of lines of spacing you want.
Tip: For even more control, click Line Spacing Options and select the exact options you want.