You seem to have a point. Does the same on my display. I haven't tried setting the font for display to something different (or the number of chords displayed on one screen) to see if that changes anything.
As a work around you might try using the Bar Settings and muting the instrument(s) you don't want to play rather than taking up the space to type the instrument letters. Might not work for you if you are trying to rest at only certain beats and not whole measures.
Good luck.