Xbox Color Profile Settings - No Access to Full Color Spectrum

So in settings under Accessability - Graphics - Color Profiles - Modify, you can change the color of friendlies, enemies, squads, etc.   There are 2 horizontal bars showing the New/Current colors and below them is a big box where I can move the thumbstick around and adjust the color.  But if I want a completely different color, how do I access the rainbow vertical bar to the right of the big square?   All I can do is change a color from dark to light but not the color itself.  Example enemy is red, but how to I get access to change it to something like pink?  I assume the horizontal bar on the right moves up/down?  I know with PC you can just move it with your mouse.

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