When any component, constraint, product entry or product exit is selected, its properties are shown in the top right panel. Here you can view and modify parameters that are related to how the selected element works. For components, all public variables are visible in this panel.
Check these links for more information about the properties of constraints, product entries and product exits. For components, please refer to the description of the specific component for more information about how the properties affect the bechavior of the component.
An example. The max_current property of the industrial socket determines how high the amperage can be without overloading the supply.