The Hair material settings are organized in Basic and Advanced modes. You can switch the mode from the toggle button (Image Modified) under the Preview Swatch.
From the Add Attribute button,you can select additional attributes that can add up to the appearance of the material. For more information, seethe Attributes section.
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Holding down Ctrl while having the Add Attribute menu open, allows selecting multiple entries without closing the dropdown.
The context options of the Color Slot allow to Copy and Paste a color from one color slot to another, as well as to reset the color selection.
A Reset option is provided in the context menu of each Number Slider. You can reset the slider value to the default one.