How to Change the Letter Size in a Printer

Click on 'Start' and then 'Control Panel'. Select 'Printers and Faxes'. If you're already using an application, you can access the printer settings by going to 'File' then 'Print.'
Right click your printer and choose 'Printing Preferences'. If you're accessing this through an application, click the 'Properties' button.
Choose 'Letter Size' from the Paper Size drop down menu and change the 'Height' and 'Width' sizes to create a custom size.
Choose a different paper size from the Paper Size drop down menu to create different project letter sizes. You can customize the size for each paper size type.
Click 'Apply' when finished. Click 'OK' to close the printer properties and continue printing your document or project.