How do I remove hidden network?

Check the router settings, see -> Recommended settings for Wi-Fi routers and access points

Recommended settings for Wi-Fi routers and access points - Apple Support

I'm not sure here, but it would seem that if you are seeing your name in Settings>Wi-Fi, that you have a network you named with your name. Is that the network listed just below the Wi-Fi switch and does it have a checkmark beside it? Can you check your router and see what is listed there for the name of your wi-fi network. Generally, a hidden network is one that the SSID is not broadcast by the router, so no one else can identify the network to try and connect to it. To be able to connect to a network that does not have the SSID broadcast, you have to know the exact name of the network as well as the password to be able to join that network.

Are you seeing a hidden network when you are attempting to connect to wi-fi? If it is not your network, you cannot control that. What exactly are you attempting to accomplish?

What is it exactly that you are trying to do?

If you are trying to connect the iPhone to a "hidden network", you will need to know the exact name of the network and the password for the network.