The Watches view of the Designer debug window, displays all the watches currently active for the Workflow. After each step executes, the watches listed in the view are re-evaluated and updated with their current values.
The Watches view contains two columns:
Watch Expression: The syntax of the watch. This can be simply a variable name, or a complex expression.
Value: The result of the watch expression. This is updated with each step execution while the Workflow is running.
You can use the Watches Debug view to add, remove, or change watches. For more information, refer to Using Watches.