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

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

?>

<aside>
  <?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( 'oficinasuport-wp-plugin/ofisuport-wp-plugin.php' ) ) {
        //plugin is activated do
    ?>
    <header>
      <h1> <?php echo esc_html__('Destacats', 'ofisuport'); ?></h1>
    </header>
	  <main id="destacats" class="ofisuport-destacats ofisuport-featured">
     <?php //get_template_part( 'template-parts/loop', 'posttype-category-number'); ?>

  <?php 
  // https://developer.wordpress.org/reference/functions/get_posts/
  // https://www.advancedcustomfields.com/resources/true-false/
  $the_query = new WP_Query(
    array(
      'post_type' => 'any',
      'post_per_page' => '4',
      'meta_query' => array(
          array(
            'key' => 'os_home_show',
            'value'=> '1',
          )
        )
    ) );
  ?>
  <?php if ( $the_query->have_posts() ) : ?> 
    <?php while ( $the_query->have_posts() ) : $the_query->the_post(); ?>


   <article class="">
      <h3 class="entry-title">
        <a href="<?php the_permalink(); ?>" rel="bookmark">
          <?php the_title(); ?>
        </a>
      </h3>
      <section class="excerpt post-excerpt">
        <a href="<?php the_permalink(); ?>" rel="bookmark" title="<?php the_title(); ?>">
          <?php the_excerpt() ?>
        </a>
      </section>
        <button class="button button-more" >
          <a href="<?php the_permalink(); ?>" rel="bookmark" title="<?php the_title(); ?>">accedeix</a>
        </button>
    </article>

    <?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 // including widget area for front page only ?> 
	<?php dynamic_sidebar( 'front-page-widgets' ); ?>
</aside>