The Quick Overview panel can be found in the left bottom corner of PCB-Investigator right below the Layer Stack Up panel. Besides, an overview over the current visualisation, whereby the red rectangle symbolises the current visible range, it offers an overview over components, nets, properties, an error log and the possibility for quickly editing the properties of a selected object.

Working with nets, you can select the nets tab to get a tree structured overview over all nets. Every net can be expanded to see, which pins are connected to it. In addition to that you have several selection methods via right click like selecting all child-objects and assigning a self-defined colour.