function plt_hide_awesome_post_images_metaboxes() {
$screen = get_current_screen();
if ( !$screen ) {
return;
}
//Hide the "Post Images" meta box.
remove_meta_box('post_image_meta_box', $screen->id, 'advanced');
}
add_action('add_meta_boxes', 'plt_hide_awesome_post_images_metaboxes', 20);