Need a second level menu

Does activeadmin support second-level menus? For example, I tried the following: "Security" under "Resources" and "Cybersecurity" and "Disaster plans" under "Security"

ActiveAdmin.register_page 'Safety' do
  menu parent:'Resources'
  content do
    render template: 'safety/safety'
  end
end


ActiveAdmin.register_page 'Cyber Security' do
  menu parent: 'Safety'
  content do
    render template: 'safety/cyber_security'
  end
end

ActiveAdmin.register_page 'Emergency Plans' do
  menu parent: 'Safety'
  content do
    render template: 'safety/emergency_plans'
  end
end

      

        
        
        
      

    

This does not work. I just see the Security menu item in the dropdown, but I don't see the other three. We are using version 0.6.6 from activeadmin.

Question: Does this version or any new version of Active-admin support layered menus? If so, how can I do this?