Here is the guide of connecting to a hidden network.

First, you need to know if your Hidden WiFi network is 2.4G or 5G.
Then you have need to connect to an existing non-hidden SSID first. This step is set up everything for you.

After you have done this, do the following:

  1. Advanced settings (luci) → Network → wifi,
    Find your current client, click Edit

  1. Input your hidden SSID info.
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  1. Finally, click save & apply