The Schematic view is the looking glass into your scene.
Use it to add new fixtures, configure their properties such as DMX channels, OSC output addreses, grouping.
Use the top-left button to cycle through various camera angles.
Schematic View with disabled Fixture button (by pressing H), leaving only the pixels for a cleaner view.
Pressing I reveals the configuration. O and P then switch between property and position gizmos.
As you zoom in, group names are revealed.