Hvis du vil vise/skjule featured image i en post, så er denne metode ganske enkel…
(Brug instpector på titlen ovenfor, så kan du se class’en ‘featured-skjul’ på DIV elementet lige ovenfor)

Du skal have fat i functions.php i dit Child Theme og tilføje koden her:

/* Define the custom box */
add_action( 'add_meta_boxes', 'balles_add_custom_box' );

/* Do something with the data entered */
add_action( 'save_post', 'balles_save_postdata' );

/* Adds a box to the main column on the Post and Page edit screens */
function balles_add_custom_box() {
    add_meta_box( 
        'balles_sectionid',
        'Hide featured image',
        'balles_inner_custom_box',
        'post',
        'side',
        'high'
    );
}

/* Prints the box content */
function balles_inner_custom_box($post)
{
    // Use nonce for verification
    wp_nonce_field( 'balles_field_nonce', 'balles_noncename' );

    // Get saved value, if none exists, "default" is selected
    $saved = get_post_meta( $post->ID, 'hide_thumb', true);
    if( !$saved )
        $saved = 'default';

    $fields = array(
        'vis'       => __('Vis', 'balles'),
        'skjul'     => __('Skjul', 'balles'),
    );

    foreach($fields as $key => $label)
    {
        printf(
            '<input type="radio" name="hide_thumb" value="%1$s" id="hide_thumb[%1$s]" %3$s />'.
            '<label for="hide_thumb[%1$s]"> %2$s ' .
            '</label><br>',
            esc_attr($key),
            esc_html($label),
            checked($saved, $key, false)
        );
    }
}

/* When the post is saved, saves our custom data */
function balles_save_postdata( $post_id ) 
{
      // verify if this is an auto save routine. 
      // If it is our form has not been submitted, so we dont want to do anything
      if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) 
          return;

      // verify this came from the our screen and with proper authorization,
      // because save_post can be triggered at other times
      if ( !wp_verify_nonce( $_POST['balles_noncename'], 'balles_field_nonce' ) )
          return;

      if ( isset($_POST['hide_thumb']) && $_POST['hide_thumb'] != "" ){
            update_post_meta( $post_id, 'hide_thumb', $_POST['hide_thumb'] );
      } 
}

Kopier single.php til dit child-theme og erstat linjen(36):

<div class="et_post_meta_wrapper"></div>

med:

<?php $hide_thumb = get_post_meta( get_the_ID(), 'hide_thumb', true); ?>
<div class="et_post_meta_wrapper featured-<?php echo esc_attr($hide_thumb); ? >"></div>

Så mangler kun CSS. Tilføj til styles.css

.et_post_meta_wrapper.featured-skjul > img:nth-of-type(1) {
	display: none !important;
}