I just uploaded my book and checked how it looked. The preview feature of the KDP program showed only the last section of the book uploaded. My book was filed in 5 separate files indicating 1 through 5. Only the section 5 was shown in the preview. I was careful that the 5 sections will be uploaded in order from 1 to 5. So the section 5 that contains Capter 6-last The End chapter was shown along with the cover page. I'm hoping that the entire book, i.e. sections 1 through 5, will appear in the real book sold. Who knows the answer to my question?