Printing Scores

Help …. how can I control how to print out a score ? The score I am using shows 4 bars wide on the screen, I am sending a score to print, setting the page to A4 and yet it is only printing the left hand side of the score ie. 2 bars and ignoring the two bars to the right ! Not even printing them on a second page. the same if I print to pdf. So frustrating - please help.