Littlebee spring 30a setup

hello ; i setup a littlebee spring 30a dshot with arduino in blhelisuite 16.7.14.902 and enabled break on stop option but break dose not work i practical test! why! why there are not damplight option in blhelisuit software but it noted in user manual of blhelisuite 16.7.14.9 ? my whatsap number is 00989112555412
my date protocole between reciver and esc is pwm 1-2 ms