When printing a layout, the available paper sizes and print settings are controlled by a Plotter Configuration File. The Printer/Plotter Configuration list is composed of all printer drivers that are installed on your computer. The Printer Configuration are the files in the folder which is specified by the ‘Plotter Configuration Path’ user preference.
Create a new plotter configuration
To create or edit a Plotter Configuration click the ‘Edit Plotter Configuration’ button on the Print or Page Setup dialog.
Define a custom paper size
Type the dimensions of the custom paper size in the Width and Height fields.