Quick Answer: The track view provides a global chord view and shows all MIDI tracks in your song, whereas the piano roll displays single MIDI events of different instrumental tracks in Liquid Notes.
Track View vs. Piano Roll ViewIn Liquid Notes, at the upper end of the application window, the tabs Track View and Piano Roll can be selected. Each selection will result in the tab switching and the corresponding mode being shown in the user interface.
The Track View shows all MIDI tracks indicating the activity of individual instruments. Additionally, you see the position of the cursor in the piece and the global chord view shows all chords of the entire piece.
The blue navigation window represents the area of selected chord regions. Dragging its left and right ends zooms into and out of this area. The entire work area can be repositioned by clicking on the navigation window and shifting it, or by clicking on any position in the track view (lower area). Click on any position in the chord view (upper area) to move the cursor there.
The Piano Roll is optimized for displaying single MIDI events of different instrumental tracks in Liquid Notes. It may happen that depending on the predefined size of the piano roll this may cause the chord regions to change in height. You can enlarge the piano roll by dragging the bottom right corner of Liquid Notes' application window, and thereby increasing this - then, pull the flap at the bottom of the piano roll downwards.