OpenStack Lab has no Network
When you log into the Horizon web GUI on in an OpenStack Lab, you will not automatically see a network. This is because you need to select the correct tenant at the top after logging in.
For example, when you log in, a project called "invisible_to_admin" is usually selected. To change it to the networks you need as the "demo" user, you must change it. To do so, use the dropdown and select demo, which has the needed networks.