If you have the white printing, you have the possibility to choose between different printing modes.
CMYK: The print is composed of the 4 colors cyan, magenta, yellow and black.
W: Only white is printed.
CMYKW: All 5 colors are printed simultaneously. This mode must be selected, for example, when calibrating with white.
W+CMYK: The right half of the nozzles prints white and the left half prints CMYK. In this way, a white background is created for printing.