How to Change the Size of Your PowerPoint Slides - BetterCloud
https://www.bettercloud.com/monitor/the-academy/change-size-powerpoint-slides/
Nov 29, 2016 · PowerPoint has a default slide size, but you don’t have to be limited by it. With this trick, you can custom set your PowerPoint slides to be any size you want. Now, if you were a PowerPoint user from way back, you’re probably used to seeing your slides in a 4:3 aspect ratio, which is very close to square.
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