Quick answer: Use the scroll bar to move through your arrangement, or to zoom in and zoom out of your arrangement.
Scrolling and zooming in Liquid NotesLiquid Notes' user interface is clean and simple, thus scrolling and zooming is really easy. We have included a scroll bar, both at the bottom end of the chord adjustment area and, more prominently, in the track view.
Here is where to find the scroll bar in Liquid Notes:
To scroll through your MIDI arrangement, simply drag the scroll bar left or right with your mouse. To zoom in or out of your piece, position the mouse pointer at either end of the scroll bar and drag it to the left or right.
When zooming in the minimum display width of chords may prevent you from zooming in further. This is a setting which can be adjusted, read more about it in this article - http://re-compose.desk.com/customer/portal/articles/1388212.