thing.php

<?php 
  if ( have_posts() ) : 
  $i = 0; 
?>
    <div id="primary" class="content-area">
        <main id="main" class="site-main" role="main">

            <section class="row posts-loop <?php if ('grid' == $blog_layout) { echo esc_attr('flex-row'); } ?>"

                <?php /* Start the Loop */
                while ( have_posts() ) : the_post(); 
                     
                  if ( $i == 0 && ! is_paged() ) {
                  ?>
                      <div class="post-wrapper <?php echo $post_column; ?>">
                        <?php get_template_part( 'template-parts/post/content', $post_template ); ?>
                    </div>
                  <?php
                    } else {                
                          get_template_part( 'template-parts/post/content', 'none' ); 
                     }
                   $i++; 
                   endwhile; 
                ?>
            </section>
            <?php the_posts_navigation(); ?>

        </main><!-- #main -->
    </div><!-- #primary -->
<?php endif; ?>