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To get this to work properly, once you have both documents open you need to enable the side by side view.
This link will show you how.. https://support.office.com/en-us/article/Compare-documents-side-by-side-52445547-7C07-475B-BB1D-22A98175EF04
If you get stuck or encounter any issues carrying out those steps to properly view your documents side by side, let me know!
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