I’m not sure how I did it, but I somehow created blank page toward the end of this project, and I want to delete that page. It’s page 48, highlighted in blue in the pages panel in the upper right. The Default page template has been applied to it, if that makes a difference. In this document, I have created other page templates (cover, table of contents, and a back page). I must have somehow added a blank page when I was creating one of those. According to the online manual, if there is a green bar above a page, I should right click and select “Remove Page Template Change(s).” I tried this. The green bar goes away, but the page remains and appears exactly the same. Any suggestions?
Open your new page template by double clicking it in yhe right panel. Make sure you copy R to L so that you have two versions of that page (odd and even page), apply and close. Now remove the page template change on the last page. 
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Problem solved. I applied my “back page” layout to the empty page 48, giving me two back pages temporarily. Then I “Removed Page Template Changes” to page 49, deleting it.