Dell C1765NFW User Manual page 62

9 Adjust the width guides and length guides until they rest lightly against the edges of the stack of print media.
10 Slide the length guide towards the printer until it touches the print media.
NOTE:
Depending on the size of print media, first slide the MPF extension backward until it stops, and then pinch the
length guide and slide it backward until it touches print media.
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