Editing : Edit Modes and Tools : Zoom Toggle : Using Zoom Toggle

Using Zoom Toggle
Depending on the Zoom Toggle preferences settings, the Zoom Toggle button in the Edit window lets you define a zoom state and toggle between it and the current zoom state, or it zooms to the settings in the Zoom Toggle preferences. When Zoom Toggle is enabled, the Edit window displays the stored zoom state. Additionally, any changes made to the view while Zoom Toggle is enabled are also stored in the zoom state.
When Zoom Toggle is disabled, the Edit window reverts to the last zoom state.
To store a zoom state using Zoom Toggle:
1 Set the Zoom Toggle preferences.
2 Make an Edit selection.
3 Click the Zoom Toggle button. It lights to indicate that Zoom Toggle is enabled and Pro Tools zoom toggles in based on the settings of the Zoom Toggle preferences.
 
If Last Used is selected for any of the following, you can adjust the corresponding zoom, height, or view in the Edit window to update the stored zoom state:
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In Commands Keyboard Focus mode (see Keyboard Focus), press the E key to enable or disable Zoom Toggle.
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Press Alt+Shift+E (Windows) or Option+Shift+E (Mac) to cancel Zoom Toggle without reverting to the previous view.
To modify the stored Zoom Toggle state, do one of the following:
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– or – 
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If Last Used is selected for any of the Vertical Zoom, Horizontal Zoom, Track Height, or Track View preferences, do the following:
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Adjust the Track Height, Vertical Zoom, Track View, or the Grid depending on which preferences are set to Last Used. Changes are stored as the new Zoom Toggle state.
To clear the stored Zoom Toggle state:
1 Make sure the Zoom Toggle button is lit (enabled).
2 Alt-click (Windows) or Option-click (Mac) the Zoom Toggle button.
To use Zoom Toggle without changing playlist views:
1 Make a selection on one or more tracks.
2 Do one of the following:
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– or – 
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With Commands Keyboard Focus enabled (see Keyboard Focus), press Alt+E (Windows) or Option+E (Mac).