To change your PowerPoint slideshow orientation from horizontal to portrait, you must access the "Slide Size" feature under the "Design" tab.
You can change the PowerPoint text direction and make it go from right to left. You can change the orientation of the text to various positions such as Horizontal, Stacked, Rotate all text 90 degrees, ...
You can change the size of a slide in your PowerPoint presentation through the "Design" menu on the Windows PC, Apple MacOS, ...
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