Hi There,
Did you mean to display the portfolio items on the post carousel?
In this case, you have to setup a child theme first:
After that copy this file x/framework/legacy/cranium/headers/views/ethos/_post-carousel.php from the parent theme to the child theme in the same directories(create them if they’re NOT existed), then replace all the code with the following code:
<?php
// =============================================================================
// VIEWS/ETHOS/_POST-CAROUSEL.PHP
// -----------------------------------------------------------------------------
// Outputs the post carousel that appears at the top of the masthead.
// =============================================================================
GLOBAL $post_carousel_entry_id;
$post_carousel_entry_id = get_the_ID();
$is_enabled = x_get_option( 'x_ethos_post_carousel_enable' ) == '1';
$count      = x_get_option( 'x_ethos_post_carousel_count' );
$display    = x_get_option( 'x_ethos_post_carousel_display' );
switch ( $display ) {
  case 'most-commented' :
    $args = array(
      'post_type'      => 'x-portfolio',
      'posts_per_page' => $count,
      'orderby'        => 'comment_count',
      'order'          => 'DESC'
    );
    break;
  case 'random' :
    $args = array(
      'post_type'      => 'x-portfolio',
      'posts_per_page' => $count,
      'orderby'        => 'rand'
    );
    break;
  case 'featured' :
    $args = array(
      'post_type'      => 'x-portfolio',
      'posts_per_page' => $count,
      'orderby'        => 'date',
      'meta_key'       => '_x_ethos_post_carousel_display',
      'meta_value'     => 'on'
    );
    break;
}
?>
<?php if ( $is_enabled ) : ?>
  <?php $wp_query = new WP_Query( $args ); ?>
  <?php if ( $wp_query->post_count > 0 ) : ?>
    <ul class="x-post-carousel unstyled">
      <?php if ( $wp_query->have_posts() ) : ?>
        <?php while ( $wp_query->have_posts() ) : $wp_query->the_post(); ?>
          <li class="x-post-carousel-item">
            <?php x_ethos_entry_cover( 'post-carousel' ); ?>
          </li>
        <?php endwhile; ?>
      <?php endif; ?>
      <script>
      jQuery(document).ready(function() {
        jQuery('.x-post-carousel').xSlick({
          speed          : 500,
          slide          : 'li',
          slidesToShow   : <?php echo x_get_option( 'x_ethos_post_carousel_display_count_extra_large' ); ?>,
          slidesToScroll : 1,
          rtl            : <?php echo json_encode( is_rtl() ); ?>,
          responsive     : [
            { breakpoint : 1500, settings : { speed : 500, slide : 'li', slidesToShow : <?php echo x_get_option( 'x_ethos_post_carousel_display_count_large' ); ?> } },
            { breakpoint : 1200, settings : { speed : 500, slide : 'li', slidesToShow : <?php echo x_get_option( 'x_ethos_post_carousel_display_count_medium' ); ?> } },
            { breakpoint : 979,  settings : { speed : 500, slide : 'li', slidesToShow : <?php echo x_get_option( 'x_ethos_post_carousel_display_count_small' ); ?> } },
            { breakpoint : 550,  settings : { speed : 500, slide : 'li', slidesToShow : <?php echo x_get_option( 'x_ethos_post_carousel_display_count_extra_small' ); ?> } }
          ]
        });
      });
      </script>
    </ul>
  <?php endif; ?>
  <?php wp_reset_query(); ?>
<?php endif; ?>
Hope that helps and thank you for understanding.