Samsung SL-M4020ND-TAA - Manual (Page 36)

Media and tray
36 2. Menu Overview and Basic Setup
The duplex unit is preset to Letter/LGL or A4 size, depending on your country. To
change the paper size, adjust the guides as shown below. Paper quantity indicator shows the amount of paper in the tray.
1 Full
2 Empty
3
Loading paper in the tray
Illustrations on this user’s guide may differ from your machine depending
on its options or models. Check your machine type (see "Front view" on
page 20).
A4
2 1