I inadvertently set the margins wrong when I set the pages up. I set them at 0.5 in. and they should be 0.75. The top and bottom margins I set at 1.0 in. for both I reset the top margin at 0.75 and left the bottom at 1.0. The book is part of a series so the page size must remain the same (.9.5 x 11.5). I set up an alternate layout with the correct settings. It's necessary for the pages to start and end up with the same words in the correct layout. There are many endnotes in the book. They don't show up correctly in the alternate (correct) layout. How do I get the alternate to be the primary and get the endnotes to correct themselves?
There are many ways to change the page setup after craetion. Take a look at these:
From there, the layout will be correct without alternate Parent pages (delete any extras you may have created). You might have to do further steps to adjust the text frames to the new pages, but if it does not automatically do so, there are several approaches to that.
Worst case, create an entirely new file with the correct page layout, then cut all the content from the first one and paste it into the new one so that it auto-flows.
Not sure if that will fix the endnote issue but if you're matching a prior layout, it should.
Make the change on the parent page. In the Pages panel the page you are editing probably has a letter on its thumbnail and that letter is probably A. Double-click on A-Parent then change the margins. Any page based on that parent page will change as well.