score orientation

Hi there. I've written a big band chart, and I'd like to be able to print the conductor's score in the conventional landscape format, to maximise the number of bars per page. I've looked and looked but can't see how to do this in MuseScore. Changing the orientation to landscape when you're about to print doesn't help; you just get the same number of bars as if you had printed portrait, and more white space either side. Can anyone help?
Thanks