The zoom buttons in the Audio Montage window allow you to apply zoom presets.
Procedure
You have the following options:
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To fit the active clips into 25%, 50%, or 100% of the available space, click the corresponding button in the lower right corner of the Audio Montage window, to the left of the Horizontal Zoom scroll wheel:
1 zooms to fit selected clips into 25% of the available space
2 zooms to fit selected clips into 50% of the available space
3 zooms to fit selected clips into 100% of the available space
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To select a specific area, click Ctrl/Cmd, and drag the rectangle over the tracks and clips that you want to zoom in on.