How to Hide Easy Invoice Admin Menus

function plt_hide_easy_invoice_menus() {
	//Hide "Invoices".
	remove_menu_page('edit.php?post_type=easy-invoice');
	//Hide "Invoices → All Invoices".
	remove_submenu_page('edit.php?post_type=easy-invoice', 'edit.php?post_type=easy-invoice');
	//Hide "Invoices → Add New invoice".
	remove_submenu_page('edit.php?post_type=easy-invoice', 'post-new.php?post_type=easy-invoice');
	//Hide "Invoices → All Payments".
	remove_submenu_page('edit.php?post_type=easy-invoice', 'edit.php?post_type=easy-invoice-payment');

	//Hide "Quotes".
	remove_menu_page('edit.php?post_type=easy-invoice-quotes');
	//Hide "Quotes → All Quotes".
	remove_submenu_page('edit.php?post_type=easy-invoice-quotes', 'edit.php?post_type=easy-invoice-quotes');
	//Hide "Quotes → Add New quote".
	remove_submenu_page('edit.php?post_type=easy-invoice-quotes', 'post-new.php?post_type=easy-invoice-quotes');

	//Hide "Easy Invoice".
	remove_menu_page('easy-invoice-dashboard');
	//Hide "Easy Invoice → Dashboard".
	remove_submenu_page('easy-invoice-dashboard', 'easy-invoice-dashboard');
	//Hide "Easy Invoice → Settings".
	remove_submenu_page('easy-invoice-dashboard', 'easy-invoice-settings');
	//Hide "Easy Invoice → Addons".
	remove_submenu_page('easy-invoice-dashboard', 'ei-addons');
	//Hide "Easy Invoice → Upgrade to Pro".
	remove_submenu_page('easy-invoice-dashboard', 'https://matrixaddons.com/downloads/easy-invoice-pro/?utm_campaign=freeplugin&utm_medium=admin-menu&utm_source=WordPress&utm_content=Upgrade+to+Pro');
}

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

Where do I put this code?