Featured Image – Save Display Settings

Save custom field in the “Featured Image” meta box.

function save_featured_image_display_settings( $post_ID, $post, $update ) {
	$field_id    = 'show_featured_image';
	$field_value = isset( $_REQUEST[ $field_id ] ) ? 1 : 0;
	
	update_post_meta( $post_ID, $field_id, $field_value );
}
add_action( 'save_post', 'save_featured_image_display_settings', 10, 3 );