You can manually add a page break anywhere you like in your document.
If you’re not in Editing View, click Edit Document > Edit in Word Online.
Place your cursor where you want to start a new page.
Choose Insert > Page Break.
While in Editing View, the manual page break will look like this:
You won’t see this in Reading View. In Reading View, manual page breaks show up as gaps between pages, just like automatic page breaks.
Tip: To quickly insert a page break using your keyboard, type Ctrl+Enter.