MIDI : MIDI Editors : MIDI Editor Window Toolbar : Notation View

Notation View
The Notation view button lets you view MIDI notes in the MIDI Editor window as music notation. In Notation view, MIDI and Instrument tracks are not superimposed, but are shown as staves just like in the Score Editor window.
 
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You can access the Notation Display Track Settings in a MIDI Editor window when in Notation view. Select the Notation Display Track Settings option from the Track List menu or Right-click in the Notes pane and select the Notation Display Track Settings option from the Right-click menu. For more information, see Notation Display Track Settings.