Simple steps to limit bandwidth over a single wifi connection ?

Hi ive tried making queues and using the home ap setting and setting a guest network with a limit set on the default home ap setting, and somehow managed to set a limit on all wireless networks including the bridge from my huawei b618 lte router to my mikrotik hap lite router…and when I logged out everything was set back to full speed again

Can anyone give me some guidance I just want to know how to limit a single wifi bandwidth on the latest routerOs version v6,4 I think