Help & troubleshooting for network issues, including connecting your device to your home Wi-Fi network, connecting to public networks, troubleshooting wireless issues & ethernet connections, and optimizing streaming performance.
Re: How do you delete old wifi networks from list of available networks?
If they are your networks you'd have to disable the radio/SSIDs in the modem/router/gateway, or otherwise unplug the device (no power) that are broadcasting the SSIDs.
If they are neighboring networks, theres nothing you can do.
If you are trying to remove saved credentials/settings for your own currently broadcasting SSIDs, you can always run the Network connection reset (Settings/System/Advanced system settings/Network connection reset).