Once a parameter is selected, you can view its properties. You can do this by either clicking again on the solid blue square, or else by clicking on the icon in the Blocks tab’s toolbar.
This will display the Properties dialog. Properties for block parameters are almost identical to properties for scenario variables, with the distinction that the former cannot be modified in the Event Modeler. For this reason all settings in the Properties dialog will be grayed out. You can view them but you cannot change them.