In Notation View, hit the Opts button.

In the Options window, center column about two thirds down, is a place to designate the Split Point manually. Default will be likely C5 (for middle C on most MIDI keyboards, but some may call it C4).

Change that split point to suit the file. In this case, try setting the manual Split Point to D of the same octave number, forcing any note below D to be shown in the Bass Clef staff.


--Mac