The easiest way to disconnect is using the network flyout menu. Removing your device from a wireless network is also a straightforward process that can be done in a few different ways. If the network flyout is not reporting any wireless network, you can try the steps shown below to turn off and on again Wi-Fi to see if that fixes the problem.
How to connect to a Wi-Fi network on range automatically.How to view a Wi-Fi connection properties.
