2. Then, the network topology diagram is built, and now the port number is not displayed.
3. If you need to display the port number in the toolbar, click the preference in the options, and the shortcut key is CTRL+R. ..
4. In the parameter selection preferences, find Always Display Port Labels to always display port labels.
5. Then check Always Show Port Labels to always show the port labels, so that you can see the port numbers on the left.