This is an accepted solution.
A similar topic was answered here
Also, check this article
UPDATE: I have figured it out...the correct way is to select the 3 dots to the right of where it says "Fulfilled" and then select "Cancel fulfillment."
The steps provided in both of the links that were given by @Nick_Marketing are no longer an option within Shopify. Is there a "new" way to do this? Thank you for any advice you might have!