To print invoice select one from list and clik button. Are available five different print templates, select appropriate for you. You can customize invoice appearance by change font type and size in Print Template settings. Print preview allow you to see how invoice will look like before print.
Print Dialog allows you also send invoice via email or save as PDF document.
You can print invoices on different formats. Available are most popular like A4, American Letter, A5 (Potrait and Landscape). Additionally you can set your own page size using Custom Setting. Default Printer Settings allows you to use page size selected in your default printer in Windows Sytem.