Make just one slide different size in Powerpoint

Question

Making a powerpoint that\'s supposed to show a before and after of a website. Since it\'s currently a long website I\'d rather make a single long slide to put it on (20\" i

Answer 1

You can't. You can only have one slide size and one orientation per presentation.

Are you projecting the presentation or delivering it on a laptop? If so, the size is sort of irrelevant.
Regardless of the slide size, the projected/displayed image will never be longer or wider than the projector/display accepts.