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

PowerPoint gives you the options you need to show your presentation exactly the way you want, including how much of the screen it takes up. To ensure there's no letterboxing (black borders) on your ...

You can change the background of your PowerPoint slides using the "Format Background" feature located in the "Design" tab.