Dropping an instance from a cluster

Shut down an instance before dropping it from the cluster. After you drop an instance, all temporary database definitions for that instance are dropped, including bindings and group memberships.

You cannot drop the last remaining instance of a cluster. If you wish to do that see “Dropping a cluster”.

In the right pane, right-click the instance to be dropped and select Delete.
Click Yes. The instance is dropped from the cluster.