Vivitek RP56HD21-A Remote User Manual page 9

Button Function
CH. Changes the channel in the PIP window.
VOL. Turns volume of the PIP window up or
down.
+ SIZE –：Adjusts the size of the PIP window.
SWAP. Swaps the main picture and
sub-picture.
STYLE. Changes the styles of PIP window.
MUTE. Turns the sound in the PIP window on
and off.