How to Hide Advanced Form Integration Admin Menus

function plt_hide_advanced_form_integration_menus() {
	//Hide "AFI".
	remove_menu_page('advanced-form-integration');
	//Hide "AFI → Integrations".
	remove_submenu_page('advanced-form-integration', 'advanced-form-integration');
	//Hide "AFI → Add New".
	remove_submenu_page('advanced-form-integration', 'advanced-form-integration-new');
	//Hide "AFI → Settings".
	remove_submenu_page('advanced-form-integration', 'advanced-form-integration-settings');
	//Hide "AFI → Contact Us".
	remove_submenu_page('advanced-form-integration', 'advanced-form-integration-settings-contact');
	//Hide "AFI → Upgrade".
	remove_submenu_page('advanced-form-integration', 'advanced-form-integration-settings-pricing');
	//Hide "AFI → Log".
	remove_submenu_page('advanced-form-integration', 'advanced-form-integration-log');
	//Hide "AFI → Get Help".
	remove_submenu_page('advanced-form-integration', 'advanced-form-integration-help');
}

add_action('admin_menu', 'plt_hide_advanced_form_integration_menus', 1000000000);
Where do I put this code?