How to Hide Chained Quiz Admin Menus

function plt_hide_chained_quiz_menus() {
	//Hide "Chained Quiz".
	remove_menu_page('chained_quizzes');
	//Hide "Chained Quiz → Quizzes".
	remove_submenu_page('chained_quizzes', 'chained_quizzes');
	//Hide "Chained Quiz → Settings".
	remove_submenu_page('chained_quizzes', 'chainedquiz_options');
	//Hide "Chained Quiz → Social Sharing".
	remove_submenu_page('chained_quizzes', 'chainedquiz_social_sharing');
	//Hide "Chained Quiz → Integrations".
	remove_submenu_page('chained_quizzes', 'chainedquiz_integrations');
}

add_action('admin_menu', 'plt_hide_chained_quiz_menus', 11);
Where do I put this code?