Enter page setup and check different parity pages in the page setup layout bar.

Insert section break at the end of each chapter to make each chapter a section. Only in this way can we make different headers and footers.

Enter the odd header in the first chapter, enter the Insert menu-Reference-Cross Reference, select title, paragraph number and body as the reference type, and select Insert after specifying which number. Select All Titles-Format Menu-Borders and Shading-Set Line Width, and click the bottom line of the text on the right.

Enter the second chapter, odd header, click the link to the previous button on the header and footer toolbar to disconnect it from the header in the previous section, and use it to set the method.

Odd number head, enter the first section setting.