If you load a paper size that is not selected automatically, specify the paper size using the control panel.
Press [Home] () at the bottom of the screen in the center.
Flick the screen to the left, and then press the [User Tools] icon ().
Press [Tray Paper Settings].
Select a tray from [Tray Paper Size: Tray 2] to [Tray Paper Size: Tray 4] for which you want to change the paper size.
Select the loaded paper size, and then press [OK].
Press [User Tools] () on the top right of the screen.
Press [Home] () at the bottom of the screen in the center.
For details about paper sizes selected automatically, see Recommended Paper Sizes and Types.
If you want to print on paper that is selected automatically after printing on a paper size that is not selected automatically, you must return the setting to [Auto Detect]. Reload the paper, and select [Auto Detect] in Step 5.