If the management server is currently evaluating all events against the conditions in a policy, the management server is enforcing that policy, and that policy is enabled. By default, policies are enabled when they are created.
If you don't want the management server to enforce a policy but also do not want to delete the policy configuration, you can disable the policy. The configuration for a disabled policy exists, but the management server does not enforce the policy. You can disable a policy in the Notification Policy Details view.