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Tips on Customizing Books Library

How to Hide Books Library Admin Menus

function plt_hide_books_library_menus() {
	//Hide "Books Library".
	remove_menu_page('edit.php?post_type=books');
	//Hide "Books Library → All Books".
	remove_submenu_page('edit.php?post_type=books', 'edit.php?post_type=books');
	//Hide "Books Library → Add New Book".
	remove_submenu_page('edit.php?post_type=books', 'post-new.php?post_type=books');
	//Hide "Books Library → Author".
	remove_submenu_page('edit.php?post_type=books', 'edit-tags.php?taxonomy=book_author&post_type=books');
	//Hide "Books Library → Publisher".
	remove_submenu_page('edit.php?post_type=books', 'edit-tags.php?taxonomy=book_publisher&post_type=books');
}

add_action('admin_menu', 'plt_hide_books_library_menus', 15);

Where do I put this code?

How to Hide the "Additional Details" Meta Box

function plt_hide_books_library_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "Additional Details" meta box.
	remove_meta_box('books_meta', $screen->id, 'advanced');
}

add_action('add_meta_boxes', 'plt_hide_books_library_metaboxes', 20);