This image shows the Variables editor contains a Variables tab that the variables and constants defined for the artifact. A Filter text field allows you to filter the list of variables. There's also a Show Input Parameters only check box which can be used to filter variables enabled as input parameters.

You can define new variables and constants by clicking the + Variable and + Constant button, respectively.

The customerNameVar variable is selected to show its properties in the Properties pane, which includes the General, Events, and Design Time tabs.