Hi Karl,

from Helix settings you cannot - it request extra custom JavaScript. We had few topics about that, and one of users shared below two tips:

1st:

// Offcanvas hack for one page website
var nav_collapse = $('.offcanvas-menu .menu');
nav_collapse.click('li a', function(event) {
       event.preventDefault();
    $('.offcanvas-init').removeClass('offcanvas-active');
});

2nd: For us, the single line at the end of main.js now works:

jQuery('.offcanvas-menu .menu').click(function(){jQuery('.close-offcanvas').trigger('click')});

I only shared, no support.