If your goal is to reset the font size higher for a one-time print on a document that was finished and saved before, after changing it up and printing you can simply close the file answering, "Don't save," when the dialog tells you that you've made changes to the file. It will still be in exactly the same configuration as when you started provided you have not done any manual "Saves" while you were editing.
Brian - Windows 10 Home, 64-Bit, Version 1809, Build 17763
Explanations exist; they have existed for all time; there is always a well-known solution to every human problem — neat, plausible, and wrong.
~ H.L. Mencken, AKA The Sage of Baltimore