A reader recently asked me if I had any "solutions or helpful hints for footnotes that simply do not fit on the page due to placement or length of the footnote itself." Well, the placement question (if I understand her correctly) got answered in the post about fixing footnotes that drop down to another page. But I'd never gotten around to addressing the problem of lengthy footnotes.
A footnote of a certain length will split to appear on two different pages, each with its own separator (the line that appears between the end of the main text and the beginning of the footnote). The continued footnote on the following page has its own distinct separator to give you a visual cue that it's a continuation. You can edit both of those separators and the continuation message as follows:
Unless otherwise noted, all instructions and screenshots are from Microsoft Office for Windows.