- On the File menu, click Page Setup.
- In the Slides sized for box, click the option you want.
If you click Custom, enter the measurements you want in the Width and Height boxes.
Note All slides in a presentation must be in one orientation, but you can choose a different orientation for notes pages, handouts, and the outline.
Tip When changing to a different page orientation, you might want to change the shape or placement of text placeholders or other items on the slide master so they're better suited for the new orientation.