The default size of the viewer is slightly more than one-sixth of your total screen area. This is the medium size setting for the viewer.
To view your video in more detail, you can change the viewer setting to large, making it nearly twice the default size.
If you want more space to see and work with the video clips, you can change the viewer setting to small, making it about one-third of the default size.
To change the viewer size:
Do one of the following:
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Choose Window > Viewer > [size].
The Window menu appears in a light gray bar across the top of your computer screen.
Drag the light gray horizontal toolbar in the middle of the iMovie window up or down.
To resize the entire iMovie window:
Do one of the following:
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To enlarge the window to full screen, click the green Zoom button in the upper-left corner of the iMovie window.
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Drag the lower-right corner of the iMovie window.
You can further rearrange the iMovie window to optimize your workspace by swapping the locations of the Project browser and Event browser.