Oce OP33 Reference Manual page 135

If you specify the default settings of the Stack Bypass beforehand, you can use it identically
to the paper drawers and the paper deck. This setting is useful if you always set paper of the
same size and type.
NOTE
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3-24 Setting Specifications That Are Common to Each Function (Common Settings)
Call up the desired screen as follows:
(Additional Functions)
Select "On," and press "Store."
Standard Stack Bypass Settings