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Disconnect from a Wi-Fi network

To disconnect and keep the network's settings: Open Wi-Fi > tap the connected network. You can also turn off Wi-Fi (learn how).
To remove the network and its passphrase from your device: Open Wi-Fi > touch and hold the network name > Forget network.

Checked against the LuneOS code and installed apps. Nobody has tried these steps by hand yet, so tell us if something differs.