You will need to adjust and tweak the layout settings of the score that you are working on. You can do that by going to:
Score>Full Score Options>Layout
and
Score>Full Score Options>More
There are options in that dialogue that will allow you to change the page formatting of your scores.
Also, after you have set the number of measures per system, adjusted your font sizes, and spacing, there is another option that you can work with to eliminate a large single bar at the end of your score. The feature is called "Link to Next Measure". To perform this action, double-click on the last measure of your score. The right-click anywhere on the score. In the right-click menu, navigate to "Measure (XX)" and select Link to Next Measure.

- Link to Next Measure.png (54.76 KiB) Viewed 4799 times
These settings take a little bit of trial and error, but by experimenting with these solutions, you should be able to get the formatting that you desire.
Regards,
-Admin