The way it works in 2.0 is regardless whether your controller is able to connect to your router or not, when you slide the switch down, it will operate a hotspot named bluespray so that you can use your wifi device to have direct connection to it.
This is designed to provide easy access to the controller. Once connected to the hotspot, just type 192.168.123.1 on your browser and you'll see the UI. You can do provisioning, program the controller, check on the network connections, etc. If you have a technician coming to service your system, just slide the switch down before leaving for work. The technician should be able to access it with his phone or tablet , service the system without you being home.
When done, you should slide the switch up. The hotspot will be disabled (so that your neighbor won't be able to access it).