With the help of experts on this forum, I've corrected a few indent/tab issues on my two Master Pages.
Here's the thing, though—this messed up the four pages that I'd already created (and then fixed manually): it put the placeholder text on top of the proper text that I'd already added to these pages, and did other things too.
Do I need to create new Master Pages to use for all the new pages I create, from now on? Or is there a way to fix a Master Page, and then tell InDesign to apply these new changes to any new pages I create, but to leave already-created pages alone?
Thanks very much, Malcolm
If the pages are to be different, you might want to create a new master page for each appearance. Conversely, if it's just a one-off deviation from the master, you could click on the document page and choose Override all Master Page Items from the Pages panel menu. The duplicate text boxes that you are seeing is because you must have reapplied the master to the document pages. This could be avoided by defining the text frame on the Master Page as a Primary Text Frame. Does that help?
So satisfying to hit that Override all Masters Page Items, and have the four pages I've already created stay as I want them.
Thanks so much Chad...