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 Assist action set or on the Referenced/Dependent Resources view's toolbar. You can restrict the scope to the current project or to one or multiple working sets. The Use only Main Files, if enabled checkbox allows you to restrict the scope of the search and refactor operations to the resources from the Main Files directory. Click read more for details about the Main Files support.
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.