To learn how you can edit the values in the Properties pane, refer to Changing flow element properties.
If multiple flow elements are selected, the Properties pane shows all mutual properties, i.e. the properties that can be set for every selected flow element. This allows you to change the (same) property for multiple flow elements at once.
If no flow elements are selected, the Properties pane shows the flow properties.
For more information, refer to Changing flow properties.
