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.
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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.