Can you post a model number, link to the esc, or as much as you know about it?
Maybe this one?
https://m.aliexpress.com/item/328568...Q1547685071214
I first thought it might be in the jumpers, but it doesn't look like that one can do what you want. Looks like just
battery volt cutoff... put in Lipo.
Forward, brake, reverse / or reverse lockout ... you're stuck with brake and low power reverse
The esc switch on the pigtail should be the on/off for your BEC. Make sure you pull the red wire out of one of the RX plugs on one esc, then ignore that ones switch. On the other, extend the switch wires so you can mount it somewhere accessable to turn model on/off.
I'd try to find an esc that can handle bigger than the size motor you're spinning, with equal amps fwd/rev, no brake. Either a large bec or maybe an external one.