Its a type of aim mechanic some games use. Basically, instead of the look speed increasing exponentially like in cod, or the look speed increasing at a steady rate like linear, dual zone makes it so there is 2 aiming zones. There is the inner zone, which is like the first 90% of your stick, and it slows your movement speed down so you can be really accurate. Then, the last 10% of your stick is the outer zone, and that ramps ur speeds up really high so u can still turn around fast. Its like having a high sensitivity so u can flick well and stuff, but u keep the precision of low sens

Its kinda hard to explain but it would be awesome if they added a curve editor to the controllers and u were able to make any game dual zone.