The preview panel in the storyboard builder includes an aspect ratio switcher. Click 16:9, 9:16, 4:5, or 3:4 to see how your video will be framed in each format.
This is especially useful for making sure key parts of your images are not cut off in the vertical and feed formats.
The framing preview updates in real time as you switch ratios. It helps you plan your video for multiple platforms from a single storyboard.