Basic Mixing : Views in the Mix and Edit Windows : Hiding Views in the Edit Window
 
Hiding Views in the Edit Window
You can quickly hide View columns in the Edit window using the mouse with keyboard modifier.
To hide a View column in the Edit window:
*Option-click (Mac) or Alt-click (Windows) at the top of the column you want to hide (Comments, Instrument, Inserts, Sends, I/O, or Real-Time Properties).