I have created three roofs in one project file. Why don´t I get a circuit design connection in the inverter result?

In the tab “Inverter” → “device selection” area you can specify whether the calculation is to be started individually per roof area or across all roofs.

This setting can be found below the inverter list in the “Sizing limits” section.

Button “Sizing limits” → Check the box “Circuit design independent of roof”.