Thank you for the additional information.
In this case, you get the expected behavior, because you start from White.
In the hue-brightness-saturation color space, this results in 100 (i.e., max) brightness. Thus, no matter what RGB color you start from, the color will always be white, because it is always so bright to become white.
If you start from Black, you will get the same behavior, you will always stay at 0 brightness (i.e., complete blackness) and it will not matter whether the color that is so black as to become red is supposed to be red, yellow, green or any other color.
Clicking on No Color changes the brightness value, so you can start changing RGB colors as a side effect.
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