System Configuration : Preferences : MIDI Preferences : Basics Section

Basics Section
Remove Range Selection After Opening the MIDI/Score Editor
When selected, the MIDI Editor and Score Editor open with no Edit selection. When this option is disabled, the MIDI Editor and Score Editor open with the current Edit selection intact.
Use MIDI to Tap Tempo
When enabled, you can tap a MIDI keyboard to enter a new tempo value into a tempo field.
Display Events as Modified by Real-Time Properties
When enabled, Pro Tools displays the effects of Real-Time Properties in the Edit, MIDI Editor, and Score Editor windows, and the MIDI Event List.
Use F11 Key for Wait for Note
When enabled, pressing the F11 Function key puts MIDI recording in Wait for Note mode.
Automatically Create Click Track in New Sessions
When enabled, Pro Tools automatically creates a new click track in new sessions.
Default Thru Instrument
This option lets you set the default MIDI Thru instrument. You can select a predefined device from your available MIDI instruments, or select First Selected MIDI Track to use the assigned MIDI output of the first selected MIDI or Instrument track. When multiple MIDI or Instrument tracks are selected, the instrument in the selected track that is closest to the top of the Edit window (or closest to the left edge of the Mix window) is used. Select None to only route MIDI Thru record enabled MIDI and Instrument tracks.
Pencil Tool Resolution When Drawing Controller Data
This option lets you set the default resolution for MIDI controller data created with the Pencil tool. Setting this to a lower resolution helps avoid creating controller data that is unnecessarily dense. The value range is from 1 to 100 milliseconds.
Global MIDI Playback Offset
This option lets you set an offset in samples to compensate for MIDI latency. Entering a value here has the same effect as setting an offset with the MIDI Track Offsets command. Offset values can be positive (later) or negative (earlier).
Double-Clicking a MIDI Clip Opens
This option lets you specify what happens when you double-click MIDI clips with the Grabber tool on MIDI and Instrument tracks in the Edit window.
MIDI Editor
Opens the MIDI clip in a MIDI Editor window.
Score Editor
Opens the MIDI clip in the Score Editor window.
MIDI Event List
Opens the MIDI clip in the MIDI Event List.
Name Dialog
Opens the Name dialog for the MIDI clip.