Activeadmin disabling the "new resource" method

Try config.clear_action_items! to remove the link to New and other links on top of the table

Previous solution didn`t work for me, so here is general solutions, that works always:

ActiveAdmin.register Book do
  actions :index

  #or like that
  #actions :all, :except => [:destroy]

  index do
    column :title
    column :author
  end  
end