Dear Steve,
If you have extra empty pages that do not disappear by themselves, it could be because their layout has been modified. You can see that in Engrave mode, in the upper right panel. Pages that have the layout modified have a bottom right corner in red. You can get rid of all the changes applied to those pages by selecting them and click on the icon on the right that looks like a dashed page (mouse popup says “Removes Overrides”).
I guess the pages will then disappear.
Hope it helps !