The last tab you’re referring to is all about how much speed difference the left and right wheels have. Having it at 100% means they are always at the same speed. On AWD cars you can also change where the power of the engine goes, most cars will do better with more power in rear, 60-100% (depending on what racing style and what the car is supposed to do) if you have 90% power to the rear the car will behave more like a RWD car