Microsoft C4500 - Manual (Page 95)

Changing the Paper Size
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C
Press [Tray Paper Settings] tab.
D
Select the tray for which you want to change the paper settings.
Press either of [Tray Paper Size: Tray 2] to [Tray Paper Size: Tray 4].
E
Select the loaded paper size and feed direction, and then press [OK].
The set paper size and feed direction is displayed.