It works as designed:
You can change L, a, and b independently since - saturation is no independent
parameter in Lab
You can enter precise values with right mouseclick on the slider
BTW try a look into the manual:
https://www.darktable.org/usermanual/en/module-reference/processing-modules/color
In my opinion, the "color lookup table" module doesn't work as well as it
should.
That is, if I want to change a color at will and after selecting it, I act
on a slider, whether I am working in a relative or absolute way, the
sliders move at the same time and this does not allow you to perform or
f
