Hello,

That’s a portfolio page. Please check a video tutorial here: https://youtu.be/AYTADwEdM_w

To add comas between categories you’ll need to edit theme files. The responsible file is tower\includes\view\portfolio\loop-grid.php and the block of code:

if(is_object($item_categories) || is_array($item_categories))
    	{
    		foreach ($item_categories as $cat)
    		{
    			$sort_classes .= $cat->slug.' ';
    		}
    	}

To add comas, just add a coma inside the '' (space). Example:
$sort_classes .= $cat->slug.', ';

Best regards!