How to Hide the "Maintenance Status" Admin Menu

function plt_hide_plugginsight_maintenance_status_menus() {
	//Hide the "Plugins → Maintenance Status" menu.
	remove_submenu_page('plugins.php', 'plugginsight-maintenance-status');
}

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

Where do I put this code?