Set single space as the default - Microsoft Support
Set single space as the default. Go to Design > Paragraph Spacing > Custom Paragraph Spacing. Under Line Spacing, choose Single. At the bottom, select New documents based on this template. Select OK.
Single-space the lines in a document - Microsoft Support
Single-space your document. Select the top of the document. Go to Design > Paragraph Spacing. Choose No Paragraph Space. This overrides the settings of the style set you're currently using. To return to the original settings: Go to Design > Paragraph Spacing.
Change the line spacing in Word - Microsoft Support
Change the line spacing in an entire document. Go to Design > Paragraph Spacing. Choose an option. To single space your document, select No Paragraph Space. To return to the original settings later, go to Design > Paragraph Spacing and choose the option under Style Set.
Adjust indents and spacing - Microsoft Support
Choose Center to center text with a ragged left and right edge (Ctrl+E). Choose Right to align text to the right with a ragged left edge (Ctrl+R). Choose Justify to align text both left and right, adding space between words (Ctrl+J). The level at which the paragraph appears in Outline view.
Change spacing between paragraphs - Microsoft Support
Click anywhere in the paragraph you want to change. Go to Layout, and under Spacing, click the up or down arrows to adjust the distance before or after the paragraph. You can also type a number directly. Update the spacing between paragraphs without changing the whole document.
Change the spaces between text - Microsoft Support
Select the text that you want to change. On the Home tab, click the Font dialog box launcher (circled in green in the screenshot below), and then click the Advanced tab. In the Spacing box, click Expanded or Condensed, and then specify how much space you want in the By box.