Brother FAX-3800 - Manual (Page 22)

P R I N T E R D R I V E R S E T T I N G S ( F O R W I N D O W S ® O N L Y ) 1 - 19
Device Settings Tab (Not Available)
Form To Tray Assignment – The paper size is displayed. If you want to change
the paper size, click the Advanced button in the Paper/Quality tab, and then
select another paper size.