Press [Original Settings].

Press [Original Size].
Specify the original size, and then press [OK].
Select the original orientation, and then press [OK].

Press [Dup./Combine/Series].
Press [Series/Poster].
Select [2 Sided
1 Sided], and then press [OK].
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If you specified [2 Sided
1 Sided], you can specify the orientation. For details, see Specifying the Original and Copy Orientation.