You can add a border to a PowerPoint slide by adding a rectangle shape and removing the fill color, which will give the appearance of a border.

When you open a Microsoft Office document, you will see some features on the menu bar called tabs. Under each tab there are various tools you can use in your Office document, whether to edit or modify ...

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