In 2WD hold the Trac button, first it will turn off traction control and a few seconds later it will also turn off VSC. Not sure how long it stays off and what turns it back on. In 4WD it`s all turned off unless you push Atrac.
just another picture.
Does that turn it all off though? I have never done it but in most rigs stability control remains and that is what stops you from doing doughnuts I think.