Rubenz Theme: Change post type in slider

<?php

/**
 * Portfolio Fullscreen Slider – change post type
 */
add_filter( 'arts/elementor/rubenz_widget_portfolio_fullscreen_slider/query_args', 'custom_rubenz_widget_portfolio_fullscreen_headings_slider_query_args' );
function custom_rubenz_widget_portfolio_fullscreen_headings_slider_query_args( $args ) {
  $args = array(
    'post_type' => 'page', // page, post, arts_portfolio_item, etc
  );

  return $args;
}