app/helpers/application_helper/button/ab_button_new.rb
class ApplicationHelper::Button::AbButtonNew < ApplicationHelper::Button::ButtonNewDiscover
def visible?
super && !(@view_context.x_active_tree == :ab_tree &&
@view_context.x_node.split('_').length == 2 &&
@view_context.x_node.split('_')[0] == "xx-ab")
end
end