Samsung J320 - Disconnect Wi-Fi

Connectivity 223
Tap More > Advanced. 3.
 The advanced Wi-Fi settings menu appears.
Configure your Wi-Fi settings. 4.
 Your Wi-Fi settings changes are saved.
Disconnect Wi-Fi
You may want to remove a connected Wi-Fi network.
From home, tap Apps > Settings > Wi-Fi . 1.
 The Wi-Fi settings menu appears.