How to Hide POP – Free Electronic Invoices & Legal Documents Generator for eCommerce (ex-WooPop) Admin Menus

function plt_hide_woopop_electronic_invoice_free_menus() {
	//Hide "POP".
	remove_menu_page('wc_el_inv-options-page');
	//Hide "POP → POP".
	remove_submenu_page('wc_el_inv-options-page', 'wc_el_inv-options-page');
	//Hide "POP → General".
	remove_submenu_page('wc_el_inv-options-page', 'admin.php?page=wc_el_inv-options-page&tab=general');
	//Hide "POP → Checkout".
	remove_submenu_page('wc_el_inv-options-page', 'admin.php?page=wc_el_inv-options-page&tab=provider-integration');
	//Hide "POP → Numeration".
	remove_submenu_page('wc_el_inv-options-page', 'admin.php?page=wc_el_inv-options-page&tab=numeration');
	//Hide "POP → Documents".
	remove_submenu_page('wc_el_inv-options-page', 'admin.php?page=wc_el_inv-options-page&tab=invoice');
	//Hide "POP → Advanced".
	remove_submenu_page('wc_el_inv-options-page', 'admin.php?page=wc_el_inv-options-page&tab=advanced');
	//Hide "POP → Invoices".
	remove_submenu_page('wc_el_inv-options-page', 'admin.php?page=wc_el_inv-options-page&tab=xml');
	//Hide "POP → Integrations".
	remove_submenu_page('wc_el_inv-options-page', 'admin.php?page=wc_el_inv-options-page&tab=integration');
	//Hide "POP → Wizard setup".
	remove_submenu_page('wc_el_inv-options-page', 'admin.php?page=wc_el_inv-options-page&tab=wizard&wizard=init');
}

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