You can enable or disable the front panel and LAN port status lights by logging into the router's configuration portal or by use of the Nokia WiFi app for iOS and Android.

Using the Nokia WiFi app

Open the Nokia WiFi app and tap the Network on the bottom menu. Your Nokia router is the first device below the Internet icon. It is the icon with the light blue background (in this case XS-2426G-B). Tap that icon.

You will now see a section called LED Light. Tap the slider to enable or disable all the status the lights on the router.