How to Hide Encyclopedia Lite Admin Menus

function plt_hide_encyclopedia_lexicon_glossary_wiki_dictionary_menus() {
	//Hide "Settings → Encyclopedia".
	remove_submenu_page('options-general.php', 'encyclopedia-options');

	//Hide "Encyclopedia".
	remove_menu_page('edit.php?post_type=encyclopedia');
	//Hide "Encyclopedia → All Entries".
	remove_submenu_page('edit.php?post_type=encyclopedia', 'edit.php?post_type=encyclopedia');
	//Hide "Encyclopedia → Add Entry".
	remove_submenu_page('edit.php?post_type=encyclopedia', 'post-new.php?post_type=encyclopedia');
	//Hide "Encyclopedia → Tags".
	remove_submenu_page('edit.php?post_type=encyclopedia', 'edit-tags.php?taxonomy=encyclopedia-tag&post_type=encyclopedia');
	//Hide "Encyclopedia → Settings".
	remove_submenu_page('edit.php?post_type=encyclopedia', 'options-general.php?page=encyclopedia-options');
}

add_action('admin_menu', 'plt_hide_encyclopedia_lexicon_glossary_wiki_dictionary_menus', 21);

Where do I put this code?