Brother DCP1200 - Manual (Page 41)

M A K I N G C O P I E S 3 - 9
AUTO reduction ratio cannot be used if you are copying onto paper that is
not the same size as the original. For the 2in1 and 4in1 copy options, you
must use a pre-set ratio. Poster must stay at 100%.
Making Special Copies
1 Insert the original in the ADF or on the scanner glass.
2 Press Option repeatedly to select 4in1, 2in1 or POSTER.
3 Using the numeric keys, enter the number of copies.
4 Press Copy .