.trigger set "whatever_you_want_here" in the MC chat .
Or add
{
"version": 4.0,
"RENDER_SCALE": 1.0,
"commandtrigger": "," <- Add this line in.
}
To your EMC_config.json in libraries/EMC/1.16.5/configs/
(Currently submitted a bug with having your trigger/prefix changed. After typing the <new_trigger>help command. Don't click on the <<>> for next and previous page in the MC chat.)