Searching and Refactoring Operations Scope in Schematron Documents
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. The Use only
                  Master Files, if enabled checkbox allows you to restrict the scope of the
               search and refactor operations to the resources from the Master Files
               directory. Click read more for details about the Master Files
                  support.
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. The Use only
                  Master Files, if enabled checkbox allows you to restrict the scope of the
               search and refactor operations to the resources from the Master Files
               directory. Click read more for details about the Master Files
                  support. 
Define Scope Dialog Box

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.
