Editing : Edit Modes and Tools : Zoomer Tool : Normal Zoomer Tool

Normal Zoomer Tool
To zoom around a certain point in a track:
1 Do one of the following:
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– or – 
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Right-click on any track and select Tools > Zoomer Tools > Normal Zoom.
2 Click once with the Zoomer tool at a location within the track. All tracks are zoomed in by one level and the Edit window is centered around the zoomed location.
3 To zoom back to the previous level, Alt-click (Windows) or Option-click (Mac) with the Zoomer tool.
To zoom into a particular track area:
1 Do one of the following:
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– or – 
*   
Right-click on any track and select Tools > Zoomer Tools > Normal Zoom.
2 Do either of the following:
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To zoom horizontally only, drag with the Zoomer tool in the track’s playlist.
– or – 
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To zoom horizontally and vertically, press Control (Windows) or Command (Mac) while dragging in the track’s playlist.
 
The zoomed area fills the entire Edit window.