Epson C11CG04201 User Manual page 148

You see the Main tab of your printer settings window:
Note: For more information about a setting, right-click it and select Help.
4. For the Paper Source setting, select where you loaded the paper you want to print on.
5. Select the size of the paper you loaded as the Document Size setting.
Note: You can also select the User-Defined setting to create a custom paper size.
6. Select the orientation of your document.
Note: If you are printing an envelope, select Landscape.
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