Canon LBP7210Cdn Manual page 276

setting.
Specify the setting for [Print Style].
(1) Display the [Finishing] sheet.
(2) Select [2-sided Printing].
NOTE
Using Preview to specify [2-sided Printing]
You can specify [2-sided Printing] using Preview.
"Using Preview to Configure the Printing Preferences"
Specify the settings for [Paper Source] and [Paper Type].
(1) Display the [Paper Source] sheet.
(2) Select the paper source you want to use.
(3) Select the type of the paper loaded in the paper source.