Mac Pages Is Actually Two Apps In One

Pages is both a Word Processor and a Page Layout app. It behaves differently in a number of key ways depending on which mode you are in. With a Word Processing template you get body text that flows from one page to the next automatically. With a Page Layout template you get a blank canvas on each page and pages can be reordered easily.

 https://www.youtube.com/watch?v=tPCVdcYqeCw