Oce OP33 Reference Manual page 133

You can set the printing priority. A job that is set to a high priority is printed preferentially after
the job currently being processed.
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3-22 Setting Specifications That Are Common to Each Function (Common Settings)
Call up the desired screen as follows:
(Additional Functions)
Select the printing priority, and press "OK."
NOTE
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Press "Done."
The specified mode is set and the display returns to the Basic Features screen.
Printing Priority