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The screenshot shows that you have an RKE template in use. RKE templates are designed to restrict Kubernetes configuration options from being edited. To upgrade Kubernetes there are two options: either change Kubernetes version in the RKE template and upgrade to the new version of the template, or mark the Kubernetes version as “allow user override” in the RKE template and upgrade the cluster to use the new version of the template.

Thanks for the info @tall-school-18125 🙂