How to Hide Kirki Admin Menus

function plt_hide_kirki_menus() {
	//Hide "Kirki".
	remove_menu_page('kirki');
	//Hide "Kirki → Kirki".
	remove_submenu_page('kirki', 'kirki');
	//Hide "Kirki → Canvas".
	remove_submenu_page('kirki', 'kirki-home');
	//Hide "Kirki → Submissions".
	remove_submenu_page('kirki', 'kirki-submissions');
	//Hide "Kirki → Role Managers".
	remove_submenu_page('kirki', 'kirki-role-manager');
	//Hide "Kirki → Settings".
	remove_submenu_page('kirki', 'kirki-settings');
}

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

Where do I put this code?