Zooming in and out
When editing content on the timeline, you can change the level of detail for the content by zooming in or out. By zooming in on the timeline, the time is displayed in smaller intervals, which lets you see your project in greater detail. Conversely, by zooming out on the timeline, the time is displayed in larger intervals, which lets you see an overall view of the timeline and its contents.
When first beginning to edit your project, you might want to zoom out to view the timeline in less detail. This lets you see an overall view of the timeline and how the contents and individual clips are arranged. After you have arranged the clips, you can zoom in on the timeline and edit individual clips on the timeline. The Zoom to Fit command automatically adjusts the timeline interval displayed so you can see the entire contents of your project without needing to scroll through the timeline.
Just as you can zoom in our zoom out on the timeline, you can also change your overall view of the storyboard. You can drag the storyboard up to increase the size of the cells if you want to see fewer cells on the storyboard so the cells appear larger. Conversely, if you want the cells to display smaller so you can see more cells on your screen, you can drag the storyboard down to decrease the size of the cells.