empty page wont delete

There are times when settings in one file fill affect the pagination of the previous file.  Check the pagination settings of the files below the problem file.

You need to see it in the context of the book and the chapters following each other.

Example

Given are two documents in a book:

Chapter 1: Pagination set to "Double Sided", "1st page Side" is set to "Right", and "Before Saving and Printing" is set to "Delete Empty Pages".

Chapter 2: Pagination set to "Double Sided", "1st page Side" is set to "Right", and "Before Saving and Printing" is set to "Delete Empty Pages".

Chapter 1 starts on the right side. Assumed it has only one page of content. But the following Chapter 2 has to start on a right page as well. This is obviously only possible if Chapter 1 gets an additional second page (which then becomes the left page facing the first page of Chapter 2.

So, you would need to manually set Chapter 2 to start on a left page. (Or to start on a right page, if the previous document ends on a left page.)

Just to double-check, because I'm not certain I completely understand.

You have a document that has its pagination set to Single-Sided, delete empty pages before saving and printing, but it keeps inserting a blank page at the end of the document? And even when you use Format > Document > Delete Pages, the empty page isn't deleted?

What have you tried? Usually, it's because you've told FM to keep an even number of pages (left & right) and the program is just trying to fulfill your wishes.