How to Hide Projectopia - WordPress Project Management Admin Menus

function plt_hide_projectopia_core_menus() {
	//Hide "Projectopia".
	remove_menu_page('pto-dashboard');
	//Hide "Projectopia → Dashboard".
	remove_submenu_page('pto-dashboard', 'pto-dashboard');
	//Hide "Projectopia → Settings".
	remove_submenu_page('pto-dashboard', 'pto-settings');
	//Hide "Projectopia → My Calendar".
	remove_submenu_page('pto-dashboard', 'pto-calendar');
	//Hide "Projectopia → My Messages".
	remove_submenu_page('pto-dashboard', 'pto-messages');
	//Hide "Projectopia → All Messages (Admin)".
	remove_submenu_page('pto-dashboard', 'pto-messages-admin');
	//Hide "Projectopia → My Tasks".
	remove_submenu_page('pto-dashboard', 'pto-tasks');
	//Hide "Projectopia → All Tasks (Admin)".
	remove_submenu_page('pto-dashboard', 'pto-alltasks');
	//Hide "Projectopia → My Profile".
	remove_submenu_page('pto-dashboard', 'pto-manage-profile');
	//Hide "Projectopia → Recurring Invoices".
	remove_submenu_page('pto-dashboard', 'pto-recinvoices');
	//Hide "Projectopia → All Files (Admin)".
	remove_submenu_page('pto-dashboard', 'pto-files-admin');
	//Hide "Projectopia → Roadmap".
	remove_submenu_page('pto-dashboard', 'https://next.expresstech.io/projectopia');
	//Hide "Projectopia → Add-Ons".
	remove_submenu_page('pto-dashboard', 'pto-dashboard-addons');
	//Hide "Projectopia → Upgrade".
	remove_submenu_page('pto-dashboard', 'pto-dashboard-pricing');
}

add_action('admin_menu', 'plt_hide_projectopia_core_menus', 1000000000);

Where do I put this code?