You can adjust slide sizes for your presentations.
- On your computer, open a presentation in Google Slides.
- Click File Page setup.
- To pick a size, click the Down arrow .
- Standard (4:3)
- Widescreen (16:9)
- Widescreen (16:10)
- Custom: Below "Custom," enter a size and pick a unit of measurement (inches, centimeters, points, or pixels).
- Click OK.