Automatically enhance clips in iMovie on Mac

With the Enhance button in the toolbar, you can improve a clip’s video and audio with a single click.

Important: When you enhance a range in a clip, the adjustment is applied to the entire clip.

In the iMovie app on your Mac, select a clip in the browser or the timeline.
Click the Enhance button in the adjustments bar above the viewer.
The video and audio in the clip are automatically enhanced, and some of the other buttons in the adjustments bar (usually the Color Balance and Color Correction buttons) become highlighted, indicating that adjustments have been made in the corresponding categories. If your clip contains audio and would benefit from a volume boost, the Volume button becomes highlighted as well.

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iMovie User Guide