How to Hide Royal Access Admin Menus

function plt_hide_royal_access_menus() {
	//Hide the "Royal Access" menu.
	remove_menu_page('royal-access');
	//Hide the "Royal Access → Dashboard" menu.
	remove_submenu_page('royal-access', 'royal-access');
	//Hide the "Royal Access → Settings" menu.
	remove_submenu_page('royal-access', 'raccess-settings');
}

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

Where do I put this code?