Change colors on provided colored benchy

[Stevefu]

I loaded the 3MF file into Creality Print for the K2 multicolored benchy provided with the machine.

I wanted to change the colors, and only the colors on the first CFS unit are available. I have two CFS units, and both work.

How do I make the second CFS unit available for the color change?

[Stevefu]

I think I found it. See the attached photo. Little + icon.