The Print Article feature uses a print CSS stylesheet to format the web page for printing. This print stylesheet can be customized by adding print CSS to your site. To do this you will need to have someone who is very comfortable with CSS make modifications to your default CSS. 

Our support team cannot offer support on print specific CSS, but if you need a custom stylesheet developed for your site then you can ask to speak with our Professional Services team to see about having some custom development work done for your site.