the filter categories’ ordering do not have a facility to order them in any way you want. Only a limited ‘sorting’ parameter are accepted. If you open the  “portfolio.php” file located in the root folder of the theme and search for this block of code:

<?php wp_list_categories( array(
            ‘include’ => $args[‘include’],
           ‘taxonomy’ => ‘Categories’,
           ‘title_li’ => ”,
           ‘walker’ => $portfolioFilterWalker
      ) ); 
?>
You can modify this code so you would have it like this:
                                         <?php wp_list_categories( array(
                                                                ‘include’ => $args[‘include’],
                                                                ‘taxonomy’ => ‘Categories’,
                                                                ‘orderby’ => ‘slug’,
                                                                ‘order’ => ‘ASC’,
                                                               ‘title_li’ => ”,
                                                              ‘walker’ => $portfolioFilterWalker
                                                     ) ); 
                                          ?>

As you can see from the above code, that we added an ‘orderby’ parameter for the sorting of the portfolio categories, and an ‘order’ parameter to how we want to sort it by ASC (Ascending) or by DESC (Descending). On the‘orderby’ parameter, we can only sort it by any of this following value (default is by ID):
  1. ID
  2. name
  3. slug
  4. count
  5. term_group
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