Hue is the colour. Exposure/ luminosity and saturation is not affected.
The control image is in the middle. The Hue slider is central. I have found that the slider that controls blue hues represents the colour circle and a comprehensive version of Itten’s colour circle is the best one to consult along side this. The effects of pulling the slider hard left and hard right are evident and we can see the changes on the RGB histogram at the top.
This colour circle on this link is helpful.