I just noticed the color theme manager at the top of the color picker window and I’m guessing the idea was to provide us with a place to create color “favorites” for later use. Is this not fully implemented yet or am I just incorrect in what its supposed to be used for?
Essentially I’d love a place where I could save custom colors to a palette for quick re-use later.
It’s working. Just click on color (the on right side of circle), hold mouse button, and drag it the top bar. It should be saved.
Thank you that was exactly what I was looking for. There’s no way to drag the color back onto the picker? You just have to switch to that theme and then use the eye dropper to pick it again?
Just click on the color in the top bar 
Thanks Lukasz!