Lexmark All in One Printer - Manual (Page 45)

45 Loading Print Materials
.
4 Place the paper into the paper tray with the recommended
print side face down for single-sided printing and face up for
double-sided printing. Do not fill paper above the paper
capacity mark (fill line).
5 Squeeze the width guide lever and slide the width guide to the
left until it lightly rests against the edge of the paper stack.
6 Adjust the knob to show the size of the paper currently
loaded.
N OTE : This setting serves as a visual reminder only; it
has no effect on the operation of the printer.
7 Reinstall the tray.
Width
guide
Squeeze
here
Paper capacity
mark
Knob