Hello,
Unfortunately, this is currently not supported by default and is not recommended due to the current functionality and structure of the Portfolio Grid. But if you must use it, consider find the following code inside the js/functions.js File:
if( deviceSmallest == 0 && $(this).hasClass('wide') ) { var elementSize = ( postWidth*2 ); } else { var elementSize = postWidth; }
and add the following line after the above line:
if( deviceSmallest == 0 && $(this).hasClass('ultra-wide') ) { var elementSize = ( postWidth*4 ); } else { var elementSize = postWidth; }
and then in the HTML Code, make sure that you add both .wide and .ultra-wide Classes to the .portfolio-item Element.
This should definitely work fine. Hope this Helps!
Let us know if we can help you with anything else or if you find any further issues.