Change PowerPoint Slides From Landscape to Portrait
Open the PowerPoint presentation you want Make the change in a slide's orientation before you lay it out. Go to Design.
In the Customize group, select Slide Size to display a list of options.
Choose Custom Slide Size. The Slide Size dialog box opens.
In the Slides section, choose Portrait.
Select OK.
Choose Maximize to scale the slides to the full size or choose Ensure Fit to make sure that the content fits on the page.
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