@Bvfry
The Line between the Nodes represents the backhaul and what Deco node each unit is connected to. In most cases, it will look like this. the Main unit in the middle and the remote nodes is connected to it. The icon above a line is the type of backhaul in use. In your case, it's a wireless backhaul. The color of the icon and the number of bars lit indicates the signal and strength. based on what I am seeing the Node in the Garage has a poor signal to the main unit. I would suggest moving it closer or if your home is wired for ethernet to the Garage node using the home's wiring to the main unit.