How to fix jumbled score

USING PRO 9 This looked legible until I tried to print, then it shrank, became jumbled and now stays this way no matter what zoom factor I apply.

Cubase offers several ways to clean up here.
Reduce the number of bars to 3, maybe even 2.
Apply the functions offered by the Auto-Layout menu. If it doesn’t fit, you can undo each step and try out what looks best.
Since the notes in the lower staff are all very low, you can shift the notation down an octave: