I have a book-length MS in Word 365 with many footnotes. The footnotes are numbered continuously from1 to over 1,000. I would like to begin footnote numbering over with each chapter. I understand that this should be possible if the chapters are separated by breaks, but when I have my cursor at the end of a chapter, the "breaks" button is greyed out and inoperable. As far as I can tell, the document is not "protected." Can anyone help?