Remove “show sharing buttons” metabox Jetpack from custom post type

you can try this

if (is_admin()){
  function my_remove_meta_boxes() {
    global $typenow;
    if( 'YOUR_CUSTOM_POST_TYPE' == $typenow ) {
      remove_meta_box('sharing_meta', 'YOUR_CUSTOM_POST_TYPE', 'high');
    }
  }
  add_action( 'admin_menu', 'my_remove_meta_boxes' );
}

Which removes the metabox registered by the jetpack plugin. Just make sure to change YOUR_CUSTOM_POST_TYPE with the actual name of your custom post type.

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