Also they are comparing draft vs. print layout. Computer display didn't used to have enough pixels to approximate paper, but when they did programs switched to print layout because people liked what-you-see-is-what-you-get. You can still switch back to draft mode where paper margin is collapsed and the content fills up most of the space.
This is what a more fair comparison looks like. https://i.imgur.com/wAqSvrV.png