365 won't let me enter text on some pages. Just a title. Hit enter--new page.

Writing a book with 365 (might change to another WP program now).   Word will block any text on a page except for the title. Say, Chapt 7.  You hit enter, it jumps to the next page.  I cannot backspace or delete to get back to write the beginning of a chapter.   No pictures allowed, no text.  I've deleted that chapter, still does it.  So in my book, I have blank pages....which I cannot write on.  Really dumb.   I might have to save, try Corel or another WP Program since 365 won't let me write on certain pages.