Brother EM-850fx User Manual page 134

[9] Repeat the steps 7 and 8 until you finish typing.
Every time you press the PAGE key, the carrier moves forward to the
next PF IND position.
If you press the CODE + PAGE keys, the carrier moves backward to the
previous PF IND position.
To cancel the PF IND mode, press the CODE + IND CLR keys.
R E M E M B E R ...If you press the CTR key at the PF IND position, the text is
centered between the PF IND position and the next tab stop (or right margin).