When formating the score to print properly, with the present setup, the user must page through the entire score to see how the last page will print. A Horizontal Scroll Bar or at least a Last Page button would be nice improvement in the Print Preview, especially where a large orchestral score is involved.
Go to Print Preview from the end of your score, and you will see the last page. Print Preview opens wherever you are in the score when you click on the menu icon.