The Hue-Chroma filter is another way to modify saturation. Clear explanations about chroma and saturation can be found at https://ninedegreesbelow.com/photography/changing-saturation-using-lch-chroma.html .
« Presets » are a common feature for several Colors command. You can find its description in Section 8.1, « Entrées du menu « Couleurs » ».
The slider and the small arrow buttons allow you to select a hue in the color circle (-180°, 180°).
« Chroma » is the purity of the color. Moving this slider makes colors more or less pure.
This slider and the small arrow buttons allow you to select a value (luminosity): -100, 100.
These are common features described in Section 8.1, « Entrées du menu « Couleurs » ».