The scope is a collection of documents that define the context of a search and
refactor operation. To control it you can use the 
Change scope operation, available
in the Quick Fix action set or on the
Resource Hierarchy/Dependency View toolbar. You can restrict the
scope to the current project or to one or multiple working sets.
Change Scope Dialog
The scope you define is applied to all future search and refactor operations until you modify it. Contextual menu actions allow you to add or delete files, folders, and other resources to the working set structure.
