The @ symbol that appears in the bottom left of the luminaires tab when Control hierarchy is active, allows automatic control to be resumed for luminaires that have been under manual control. i.e. If you have used a switch to manually activate a scene, the Resume automation option will disable that scene and allow the luminaires to be controlled by sensors or timers; in other words the “automatic” functionality of the system will be restored.
Pressing @ will open a popup window asking you to confirm that you wish to Resume automation. Pressing @ when a luminaire Group is open will only resume automation for luminaires in that group only. In other cases it will apply to all luminaires in the network