Double-click a MIDI region (if Logic Pro > Settings > General > Editing > “Double-clicking a MIDI region opens” is set to Score).
Do one of the following:
Choose Window > Score (or press Command-5).
Drag the Score Editor by its title out of the main window.
Press and hold Option and double-click any event in the Piano Roll Editor.
To show the Score Editor inspector: Choose View > Show Local Inspector from the Score Editor menu bar.
To hide the Score Editor inspector: Choose View > Hide Local Inspector from the Score Editor menu bar.
The following MIDI regions are not displayed in the Score Editor: Muted MIDI regions (if Hide Muted Regions is selected in File > Project Settings > Score > Global), MIDI regions on muted tracks (if Hide Muted Tracks is selected in File > Project Settings > Score > Global), and MIDI regions for which the Score parameter is turned off in the PDF
Control Surfaces Support Guide: PDF