How to change your Microsoft PowerPoint slideshow orientation to portrait mode

To change your PowerPoint slideshow orientation from horizontal to portrait, you must access the "Slide Size" feature under the "Design" tab.

How to change the size of slides in Microsoft PowerPoint to match your customized presentation style or screen size

You can change the size of a slide in your PowerPoint presentation through the "Design" menu on the Windows PC, Apple MacOS, ...
PC Magazine

Microsoft Adds Portrait Mode to PowerPoint iOS App

On-the-go users can now create and edit slides in vertical orientation. Microsoft this week added the ability to create slides in portrait mode using PowerPoint for iOS. The feature is currently ...
The Financial Express

Microsoft adds portrait mode to PowerPoint slides for iPhones and iPads

Microsoft on Tuesday announced portrait mode in PowerPoint for some users. The news was shared by the product manager of the PowerPoint Mobile team on company’s official website. The new feature is ...