How to Hide the "Scroll top top | inventivo" Admin Menu

function plt_hide_scroll_to_top_inventivo_menus() {
	//Hide the "Settings → Scroll top top | inventivo" menu.
	remove_submenu_page('options-general.php', 'inventivo_scroll_to_top_setting_admin');
}

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

Where do I put this code?