Use the following steps to delete unused networks.
Log into NetCloud Manager.
Click in the left-side navigation panel.
Select the desired group. Alternatively, to make configuration changes to an individual device, navigate to the Devices page and select a device.
Click and then .
Navigate to NETWORKING > Local Networks > Local IP Networks.
Select any network that will not be used and click .
Click to confirm and permanently delete the network.
Select a network that will be in use and click .
Click .
In the IPv6 Address Source drop-down menu, select .
Click Save.