A couple of days ago someone sent me a Tweet asking if it was possible to arrange Google Slides presentations in portrait mode instead of the default landscape mode. It is possible to do that even though Google Slides doesn’t contain a standard “portrait layout” option in any of the editing menus. To put Google Slides into portrait mode you have to apply custom sizing. That option is found when you open the File drop-down menu and select Page Setup. In Page Setup you can apply any size and aspect ratio of your choosing. Watch my short video below to learn how to apply custom sizing to Google Slides.