You can change the size of a slide in your PowerPoint presentation through the "Design" menu on the Windows PC, Apple MacOS, ...
To edit a footer in your PowerPoint slides and include citations or notes, you'll need to access the Header & Footer menu ...
Creating a presentation that stands out is no small task. So, if you’re new to Microsoft PowerPoint, you’ll need to familiarize yourself with the features and tools you need to build a presentation.