Editing : Making Selections : Navigating Your Pro Tools Session : Zooming to the Entire Session and to the Edit Selection

Zooming to the Entire Session and to the Edit Selection
To zoom your entire session into view:
1 Press Alt+Start+A (Windows) or Option+Control+A (Mac) to horizontally fit the begging and end of your session to the length of the Edit window.
2 Press Alt+Start+Up Arrow (Windows) Option+Control+Up Arrow (Mac) to fit all of the tracks in your session to the height of the Edit window.
Now that you can see your entire session in the Edit window, identify the location to view for editing.
To zoom to an Edit selection:
1 With the Selector or the Grabber tool, make an Edit selection.
2 Press Alt+Start (Windows) or Option+Control+F (Mac) to fit the length of the selection to the length of the Edit window.
3 Press Control+Start+Up Arrow (Windows) or Command+Control+Up Arrow (Mac) to zoom the Track Height of the Edit selection to fit to the height of the Edit window.
To zoom to an Edit selection using Zoom Toggle:
1 With the Selector or the Grabber tool, make an Edit selection.
2 Press Start+E (Windows) or Control+E (Mac) to enable Zoom Toggle.
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Set the Track Height option for Zoom Toggle to Fit To Window in the Editing Preferences.
3 Do one of the following:
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Press Start+E (Windows) or Control+E (Mac) again to revert to the preview zoom state.
– or – 
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Press Alt+Shift+E (Windows) or Option+Shift+E (Mac) to cancel Zoom Toggle without reverting to the previous view.