How do I make a PowerPoint slide portrait?

To make a PowerPoint slide portrait, follow these steps:

1. Open the PowerPoint presentation and go to the “Design” tab in the ribbon.
2. Click the “Slide Size” button in the “Customize” group.
3. In the “Slide Size” window, select the “Custom” option.
4. In the “Width” and “Height” fields, enter the desired dimensions for the slide. Make sure that the “Orientation” field is set to “Portrait”.
5. Click “OK” to apply the changes.

The slide size will be changed to the custom dimensions that you specified, with a portrait orientation.