Canon CLC5151 Reference Manual page 126

Press [OK] proceed to step 6.
If the following screen is displayed, press [OK] adjust the width of the slide guides
specify the desired paper size.
2
If the following screen is displayed, adjust the width of the slide guides to match the paper
size stored in Stack Bypass Standard Settings, or set Stack Bypass Standard Settings to
'Off' in Common Settings (from the Additional Functions screen). (See "Standard Paper for
the Stack Bypass," on p. 4-47.)
IMPORTANT
Set the paper size to the same size as the paper loaded in the Stack Bypass.
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Making Prints Using the Stack Bypass