Select All (CTRL A) and highlight *all* your text. Then move the right margin to where you want it. That will integrate the new text into the old text.
Or if you have .docx, go to "View" and "Draft" in a banner that appears when you click View. I do it all the time. I just realized I do it in .doc too. That's how I beta read versions side by side on the screen.
r/
Artemis
