Oki CX2731 User Manual page 41

3 Adjust the paper width guides: on the left guide (1), squeeze the
blue release lever and press down to slide the paper width guides
to the width of the paper to be loaded.
4 Adjust the paper stopper (1) for the paper length: press down
lightly on the blue release lever (2), then slide the paper stopper
to the length of paper to be loaded. The length selected will show
in the view window (3)
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CX2731 MFP Basic User's Guide