Rubenz Query Filter by Category [target to specific page]

add_filter( 'arts/elementor/rubenz_widget_portfolio_fullscreen_headings_slider/query_args', 'custom_rubenz_widget_portfolio_fullscreen_headings_slider_query_args' );
function custom_rubenz_widget_portfolio_fullscreen_headings_slider_query_args( $args ) {

  global $post;

  if ( $post->ID === 9 ) {

    $args = array(
      'tax_query' => array(
        array(
          'taxonomy' => 'arts_portfolio_category',
          'field'    => 'slug',
          'terms'    => array( 'design' ), // include only posts of the current categories (slugs)
        ),
      ),
    );

  }

  return $args;

}