Epson SureColor P20000 Standard Edition 64" Large-Format Inkjet Printer - Manual (Page 80)

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3. If necessary, select your product name as the printer you want to use.
Note: You may also need to select Preferences , Properties , Print Settings , or Printer Properties
to view your print settings.
You see the Main tab of your printer settings window:
4. Select the Media Type setting that matches the paper you loaded.
Note: You can click Custom Settings to select a custom paper configuration.