At some point you clicked on the gear (intentionally or not) and it turned off formatting. (So you can do it manually, doing the formatting manually lets you do more things. Like access different colors, beyond the ones that the tools give you.)
But if it's turned off you gotta click the button again to turn it back on. ^.^
You can tell it's turned off because the background gets darker. At least, in the "Shades of Blue customized" color theme it does.