Module.php

public function onModuleDispatch(\Zend\Mvc\MvcEvent $e)
    {
        //Set the main menu into the layout view model
        $serviceManager = $e->getApplication()->getServiceManager();
        $navbarContainer = $serviceManager->get('loo_navigation');

        $viewModel = $e->getViewModel();
        $viewModel->setVariable('navbar', $navbarContainer);
    }