Turn off "change markers" / "line status"

I used to know where the option was to turn off the version control change markers in the gutter of the editor, but I've just spent two solid hours looking through the settings, the help, scouring Google. I just can't take it anymore. There are references to "change markers" and "line status" all through the online help, but not a word about how to turn it off. Someone please help. This Macbook Pro is too expensive to smash into little bits. :D