Hi,

To disable ajax overlay, you can make some customisation in two files: custom.js and overlay.js
The two files are located in sites/all/themes/md_phoenix/js/front
- in file custom.js, search to the code:

 $("a.overlay-ajax").click(function(){
        var url = $(this).attr("href").replace(/[#\!]/g, '' ).split("/")[1];
        //$(".overlay-section").load(url + ' #transmitter');
        portfolio_loadajax(url);
  $( "body" ).addClass( "noscroll" );
  $('.video').fitVids();
  return false;
    });

- in file overlay.js please search to the code:

$( ".portfolio-item" ).each(function() {
  var id = $( this ).find('.overlay-ajax').attr('id');
  document.getElementById( id ).addEventListener( 'click', toggleOverlay );
 });

If you comment/delete the two code above, portfolio will not have overlay. You can add condition to set which items have overlay, which ones don't have