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

Microsoft PowerPoint defaults to display slides in your business presentation in Landscape layout. This means that your slides resemble a landscape painting where the width is greater than the height.

Microsoft PowerPoint is a powerful presentation program often offered as part of Microsoft's Office suite of tools. PowerPoint allows a user to customize a presentation with animation, colors, themes ...