If you load a paper size that is not selected automatically, specify the paper size using the control panel.
Press [Tray Paper Settings] in the upper left corner of the screen.
Press [Paper Tray] tab.
Select the tray for which you want to change the paper size.
Select the [Manual Setting] check box.
Press [Edit the Settings].
Press [Paper Size].
Select the loaded paper size, and then press [Save Paper].
Press .
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 6.