Tips on Customizing Novelist

How to Hide Novelist Admin Menus

function plt_hide_novelist_menus() {
	//Hide "Books".
	remove_menu_page('edit.php?post_type=book');
	//Hide "Books → All Books".
	remove_submenu_page('edit.php?post_type=book', 'edit.php?post_type=book');
	//Hide "Books → Add New Book".
	remove_submenu_page('edit.php?post_type=book', 'post-new.php?post_type=book');
	//Hide "Books → Genres".
	remove_submenu_page('edit.php?post_type=book', 'edit-tags.php?taxonomy=novelist-genre&post_type=book');
	//Hide "Books → Series".
	remove_submenu_page('edit.php?post_type=book', 'edit-tags.php?taxonomy=novelist-series&post_type=book');
	//Hide "Books → Settings".
	remove_submenu_page('edit.php?post_type=book', 'novelist-settings');
	//Hide "Books → Tools".
	remove_submenu_page('edit.php?post_type=book', 'novelist-tools');
	//Hide "Books → Extensions".
	remove_submenu_page('edit.php?post_type=book', 'novelist-extensions');
}

add_action('admin_menu', 'plt_hide_novelist_menus', 11);

Where do I put this code?

How to Hide Novelist Meta Boxes

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

	//Hide the "Book Information" meta box.
	remove_meta_box('novelist_book_information', $screen->id, 'normal');
	//Hide the "Series Number" meta box.
	remove_meta_box('novelist_book_series_number', $screen->id, 'side');
}

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