A family of Microsoft word processing software products for creating web, email, and print documents.
Thank you, Jay. It appears that Microsoft Word's current tools will not be useful in having students show their work in order to discourage them from copying external text directly.
I agree with that conclusion.
From the beginning, Word and the other Office programs were designed as productivity tools for workers, especially those in large corporations. Most of the added features since then were aimed at the same audience. That the programs could also be useful for educators and students, attorneys, physicians, and others who require changes in their documents to be traceable or prohibitable has been a subsidiary consideration.
You can tell Microsoft about your situation through the File > Feedback page in Word, or at https://feedbackportal.microsoft.com/feedback/ . As it says there, don't expect a reply.