With the introduction of new metered pricing for Cloud Build 2.0, Unity Cloud Build has introduced a new option to explicitly select the Builder OS used by your build targets:
This supersedes the Disable Windows Builders option, which has been moved to the Basic Info screen for all build targets, made read-only to support this transition, and will be removed in a future update.
Available options (e.g. Mac, Windows) for Builder OS will vary depending on your configuration. Note also that while Teams Advanced customers may see an “Automatic” option to reflect historical workflows, this too will be removed in a future update.
Thanks,
Unity Cloud Build Team