How do I get Wi-Fi off hidden.

A hidden WiFi network is configured from the WiFi Router that provides the WiFi network. To change the visibility of your WiFi network, you’ll need to access your WiFi Routers administration page - and make changes to the configuration.

You will need to consult your Router’s User Guide - or if provided by your Internet Service Provider (ISP), you should be able to find the necessary information from the ISPs support resources.