PS Colour Picker quandry

Somehow my colour picker in PS got changed. It used to look like this:

Where it was always black on the bottom, white on the left and then blended into the “red” or whatever colour you were trying to select. Now it looks like this:

I can’t figure out how to change it back. I’ve checked under preferences and I can only change it from adobe to windows, and neither of them are how they should look. Any ideas, anyone?