1. Click ☰ > Cluster Management.
  2. Go to the cluster that you created and click Explore.
  3. In the left navigation bar, click Apps & Marketplace.
  4. Click Installed Apps.
  5. Go to the cattle-monitoring-system namespace and check the boxes for rancher-monitoring-crd and rancher-monitoring.
  6. Click Delete.
  7. Confirm Delete.

Result: prometheus-federator is uninstalled.