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I only know of Global Setting - Feature Flags menu, where Fleet can be deactivated globally.

Thats perfect, I missed this completely @dry-policeman-72946. now need to translate it into something that helm directly understands and test . Many thanks

You are welcome. I learned about it from https://ranchermanager.docs.rancher.com/getting-started/installation-and-upgrade/installation-references/feature-flags, but I did not try to disable it because we actually use fleet