How to Hide Optima Express IDX Admin Menus

function plt_hide_optima_express_menus() {
	//Hide "Optima Express".
	remove_menu_page('ihf-information');
	//Hide "Optima Express → Information".
	remove_submenu_page('ihf-information', 'ihf-information');
	//Hide "Optima Express → Shortcodes".
	remove_submenu_page('ihf-information', 'ihf-shortcodes');
	//Hide "Optima Express → Register".
	remove_submenu_page('ihf-information', 'ihf-option-activate');
	//Hide "Optima Express → IDX Pages".
	remove_submenu_page('ihf-information', 'ihf-option-pages');
	//Hide "Optima Express → Configuration".
	remove_submenu_page('ihf-information', 'ihf-config-page');
	//Hide "Optima Express → Bio Widget".
	remove_submenu_page('ihf-information', 'ihf-bio-page');
	//Hide "Optima Express → Social Widget".
	remove_submenu_page('ihf-information', 'ihf-social-page');
	//Hide "Optima Express → Email Branding".
	remove_submenu_page('ihf-information', 'ihf-email-branding-page');
}

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

Where do I put this code?