Click the "Home" tab if it isn't already enabled. Click the "Align Text Left" button in the Paragraph section of the ribbon. Note that Word doesn't have a way to mass-realign footnotes.

If Justify Text or Paragraph is not working in Microsoft Word, then here are the step you need to take to successfully fix the issue.

Learn how to change text direction in Word from right to left. You can rotate text or change the text direction using this tip for Word.