You can put 1 diode( a real diode not a led) between your maxim chip and each column line or between each row line and it will disable one of the colours.
Since I'm not sure of your exact wiring, I would suggest that you put 1 diode in series between your maxim chip and 1 of the column lines and see which colour gets disabled. If it is not what you want, flip the orientation of the added diode. That should get you there.