When you're working with a palette with very few hues you may find that the default ones aren't the ones you want. You can rotate the wheel from the Settings screen with a rotation gesture to offset the hues.
For instance, in the following video, starting from a default Red-Yellow-Blue wheel with six hues I've rotated the wheel about 30°. This gives you another six color wheel with a different set of hues that can be useful to create a more original color scheme.
Double tapping on the color wheel, also from the Settings screen, will change the wheel back to the default hues.