1. The view is automatically refreshed after the NE is added for a certain time. The period depends on the network communication. If the view is not automatically refreshed for a long time, the data packet may be lost because of the unstable network. You can choose View > Refresh on the main menu bar or click refresh on the toolbar to refresh the view.
2. If the filter tree is configured not to display this type of NEs or subnets, do as follows: