displayAs() doesn't support new line in headings

I’m porting an application from v2.0 Cummunity to v3.2.6 Enterprise.
In v2 I could create grid titles on multiple lines using displayAs() with \n in the string; but only if using double quotes.
With v3, the title is always on one line.
How can I create titles on multiple lines?

Below is a bit of test code with the table it produces below

public function test()
    {
        $crud = $this->_getGroceryCrudEnterprise();
        $crud->setTable('children');
        $crud->columns(['Child_first_name','Woodland_Monday']);
        $crud->displayAs(array(
            'Woodland_Monday' =>"Monday - 23\n* Stay Late - 4"
        ));
        $output = $crud->render();
        return $this->_example_output($output);
    }