xarxaprod-wp-theme/template-parts/section-featured.php

<?php
/**
 * Template part for displaying featured posts or "ajuts" and widgets
 *
 * @link https://developer.wordpress.org/themes/basics/template-hierarchy/
 *
 * @package Xarxaprod_theme
 */

?>

<aside id="destacats" class="home-featured home-destacats">
  <?php
        // Detect plugin. For use on Front End only.
    include_once( ABSPATH . 'wp-admin/includes/plugin.php' );
        // check for plugin using plugin name
    if ( is_plugin_active( 'xarxaprod-wp-plugin/xarxaprod-wp-plugin.php' ) ) {
        //plugin is activated do
    ?>
    <header>
      <h2> <?php echo esc_html__('Destacats', 'xarxaprod'); ?></h2>
    </header>
	  <main id="destacats" class="xarxaprod-destacats xarxaprod-featured">
   
     <?php 
     // https://developer.wordpress.org/reference/functions/get_posts/
     // https://www.advancedcustomfields.com/resources/true-false/
     $featured_query = new WP_Query(
       array(
         'post_type' => array( 'post', 'xarxaprod-ajut' ),
         'posts_per_page' => '4',
         'meta_query' => array(
             array(
               'key' => 'os_home_show',
               'value'=> '1',
             )
           )
       ) );
     ?>
     <?php if ( $featured_query->have_posts() ) : ?> 
       <?php while ( $featured_query->have_posts() ) : $featured_query->the_post(); ?>
   
         <?php get_template_part( 'template-parts/section', 'eachpost' ); ?>
   
       <?php endwhile;//end of the loop ?>
     <?php wp_reset_postdata(); ?>
     <?php else : //if no post in query ?>
         <p class="no-content"></p>
     <?php endif; //end query ?>
   
   
   
    </main>
  <?php  } //closing if is_plugin_active ?>
	<?php dynamic_sidebar( 'front-page-widgets' ); // including widget front page?>
</aside>