The color picker UI puts the selected color channel in the the slider on the right, and the other two channels in that color model in an X/Y plot on the left.
You have R (red) selected, so the slider shows you possible values of red, given the blue and green values selected to the left.
To get back to where you were, select H (hue). The slider on the right will show all the different hues, and the X/Y plot on the left will show saturation running right to left, and brightness running top to bottom.
Walter Soyka
Designer & Mad Scientist at Keen Live [link]
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
@keenlive | RenderBreak [blog] | Profile [LinkedIn]