Sessions & Tracks : Tracks : Track Height : Continuously Variable Track Height

Continuously Variable Track Height
In the Edit window, you can continuously resize the Track Height of any given track by dragging the lower boundary of the Track Controls column.
To resize the Track Height of any track in the Edit window:
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Drag the bottom line of any given track’s Track Controls column up or down. The cursor changes to indicate that you can resize the track.
The track’s Track Height changes incrementally.
 
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Hold Command (Mac) or Control (Windows) while adjusting track height for continuous, non-incremental adjustments.
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To continuously resize all tracks, Option-drag (Mac) or Alt-drag (Windows).
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To continuously resize all selected tracks, Option-Shift-drag (Mac) or Alt-Shift-drag (Windows).