So if you want to opt out, there's no setting to switch, you need to send an email with a specific subject:
> Contact us to opt out. [...] To opt out, please have your Org or Workspace Owners or Primary Owner contact our Customer Experience team at [email protected] with your Workspace/Org URL and the subject line “Slack Global model opt-out request.” [...]
> Contact us to opt out. [...] To opt out, please have your Org or Workspace Owners or Primary Owner contact our Customer Experience team at [email protected] with your Workspace/Org URL and the subject line “Slack Global model opt-out request.” [...]