At this time, commissioners don’t have a setting that restricts or prevents members from “picking against” a specific team. Members can make selections against any team each week, and there isn’t a built-in toggle to block or limit that behavior.
Workarounds (if helpful):
Self-Managed contests: You can set a house rule and manually adjust standings if someone breaks it.
We’ve shared this request with our product team for future seasons. If this setting is added, we’ll update our help docs and release notes.