If page numbers are disappearing in your Microsoft Word document, disable 'Link to Previous', switch to Print Layout view, show white space between pages, etc.

Whether you want to use page numbers to distinguish between a novel's preface and main body, a dissertation's introduction and chapters, or a textbook's content and index, using Microsoft Word's ...

Uncheck the ‘ Show page numbers ‘ option in the dialog box that appears. Click OK, and Word will insert a Table of Contents that lists your headings without any page numbers.