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.

You can change the size of a slide in your PowerPoint presentation through the "Design" menu. Microsoft PowerPoint allows you to change slide sizes on the Windows PC, Apple MacOS, and web-based apps.

Though you can always choose a premade template, you may want to customize your PowerPoint slide backgrounds manually. You can add a custom background to one or more slides, and you'll also have the ...