Hello, I wold like to add a check-box or button to have a choice between hide or display featured image in single post. i'm in wordpress 5.0.2

This is the code of my simple single.php in the theme :

<section class="article clearfix">

  <div class="head_seangle">
    <h1><?php the_title();?></h1>
  </div><!-- head_seangle -->
  <?php ap_ads_thumb(); ?>
  <div class="med">
  <?php if (get_post_meta(get_the_ID(), 'ap_video_embed', true)) : ?>
    <div class="embed-responsive embed-responsive-16by9">
      <?php echo get_post_meta(get_the_ID(), 'ap_video_embed', true); ?>
  <?php elseif(ap_option('onf_sthumb')):?>
    <div class="thumbnail">
        if ( has_post_thumbnail() ) { 
          the_post_thumbnail( 'bg' );
        } else {
          echo '<img alt="AisPanel" title="AisPanel" src="https://placeholdit.imgix.net/~text?txtsize=20&bg=eee&txtclr=8C8C8C%26text%3Dthree&txt=ap&w=728&h=300">';
  <?php endif;?>
</div><!-- med -->
<?php ap_ads_bthumb(); ?>
      <div class="conteneur_barre_outils">
    <div class="bloc_signature">
      <?php if(ap_option('onf_author')){ ?>
      <span class="edt"><?php the_author_posts_link(); ?> </span>
      <?php };?>
      <?php if(ap_option('onf_dtime')){ ?>
      <span class="time"><?php the_time('j F Y') ?> - <?php the_time('G:i'); ?></span>
      <?php };?>
    </div><!-- bloc -->
    <?php if(ap_option('onf_share')){ ?>
    <span class="soc">
      <?php if(!wp_is_mobile()){ ?>
      <?php } ?>
      <?php if(ap_option('onf_print') && !wp_is_mobile()){ ?>
        <a class="print" href="#" onclick="window.print();" class="print ar"><i class="fal fa-print"></i></a>
      <?php };?>
      <a href="https://www.facebook.com/sharer/sharer.php?u=<?php echo get_permalink( get_the_ID() )?>"  onclick="javascript:window.open(this.href,'', 'menubar=no,toolbar=no,resizable=yes,scrollbars=yes,height=250,width=600');return false;"class="fab fa-facebook"></a>
      <a href="https://twitter.com/intent/tweet?text=<?php echo get_permalink( get_the_ID() )?>" onclick="javascript:window.open(this.href,'', 'menubar=no,toolbar=no,resizable=yes,scrollbars=yes,height=250,width=600');return false;" class="fab fa-twitter"></a>
      <a href="https://plus.google.com/share?url=<?php echo get_permalink( get_the_ID() )?>"  onclick="javascript:window.open(this.href,'', 'menubar=no,toolbar=no,resizable=yes,scrollbars=yes,height=250,width=600');return false;"class="fab fa-google"></a>
      <a href="whatsapp://send?text=<?php echo get_permalink( get_the_ID() )?>" data-action="share/whatsapp/share" class="fab fa-whatsapp"></a>
    <?php };?>
  </div><!-- conteneur_barre_outils -->
  <div id="entry">
    <div class="entry">
      <?php the_content();
  </div><!-- entry -->
  <?php if(ap_option('onf_stags')) the_tags('<div class="post_tags">', ' ', '</div>'); ?>
</section><!-- article -->
    <!-- END ARTICLE -->

<!--<?php if(ap_option('onf_repost')){ ?>
<div class="moreposts">
  <div class="t"><h4>مقالات ذات صلة</h4></div>
  <div class="postlist">

    $categories = get_the_category($post->ID);
    if ($categories) :
      $category_ids = array();
      foreach($categories as $individual_category) $category_ids[] = $individual_category->term_id;
        'category__in' => $category_ids,
        'post__not_in' => array($post->ID),
        'orderby'=> 'ASC',
        'showposts'=> ap_option('repost_count'),
      $my_query = new WP_Query($args);
      if( $my_query->have_posts() ) :
        while ($my_query->have_posts()) : $my_query->the_post();$z++;
          get_template_part( 'templates/content', get_post_format() );
        endwhile; endif ;endif; wp_reset_query();?>
    <?php };?>-->

    if ( comments_open() || get_comments_number() ) :

  <?php endwhile; ?>

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