@hcw While the installation default will get used by default, it can be overridden by individual users, and there’s no global “off” switch.
I’d be curious to see a screenshot of what’s appearing in your PRs as Autofix! If it’s off at the instance level and for all members, you shouldn’t see it.
That said, it can be easy to mistake other things (like a Cloud Agent followup) for Autofix.