Default [Q] can not edit Navigation bar ring targets

in stock rom (like RomAur v6.3) i can not edit my Navigation bar ring targets . the only app i find , was gravity box , and when i edit my navigation ring with it , it appear there . but nothing happened with selecting one of them .
gravity box in cm11 worked fine , just the kill foreground app had bug .
so what should i do ?! i want it on stock rom