Sessions & Tracks : Tracks : Adjusting Track Width

Adjusting Track Width
(Mix Window)
The Narrow Mix command lets you view all tracks/channels in the Mix window at a reduced width to conserve screen space in a large session. (See Track Height, to adjust track height in the Edit Window.)
To reduce the width of tracks in the Mix window:
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Select View > Narrow Mix.
To display tracks at normal width:
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Deselect View > Narrow Mix.
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You can toggle track width by pressing Command+Option+M (Mac) or Control+Alt+M (Windows).