The default paper size for copying is A4 (8.3×11.7 in [210×297 mm]) or Letter (8.5×11 in [216×279 mm]), depending on your region.
To change the default paper size to A4, make sure the product is off, then press and hold the 
button and press the 
button to turn the product on. When the product turns on, release both buttons.
To change the default paper size to Letter, make sure the product is off, then press and hold the 
button and press the button to turn the product on. When the product turns on, release both buttons.