IIRC from my Brit Roadster days, increasing front sway bar force increases under steer. Understeer is tendency for front end to resist turning and continue straight ahead to a point. Most cars are designed to have some under steer because it’s easier for the typical driver to handle. Less or no front understeer causes the driver to feel the rear end sliding out on turns. Doesn’t cause oversteer just makes it more obvious.
An Anti-Rock has less sway bar effect so you’ll feel like the rear end has more of a tendency to swing out. I’ve always preferred less under steer to be able to swing the rear end out in more fun driving. Reducing front sway bar force allows more body lean when cornering.
I’ve got a SwayLoc which gives the benefit of a stiff and minimal sway bar. Really haven’t noticed oversteer but then oversteer is built into my driving style. Find driving in the lesser setting like Anti-Rock ok. Body lean isn’t much of an issue but side winds are more apparent. With the SwayLok in the stiff position, Jeep handles like stock.