If you are asking for “White Letters”, they can’t. If you look closely at the scribble strips, they are actually LCD (black, like a basic clock) screens with color back lighting. It would be nice to have white lettering, but physically not possible. Hopefully when they release the 1.5 feature update, they will add more colors and allow you to invert the LCD (for color letters). Those developers have a lot to do. Their hard work is appreciated.