A working set is a logical collection of projects, which you can use to limit the number of resources that are displayed in the Application Development view. By creating and using a working set, you can reduce the visual complexity of what is displayed in the Application Development view, making it easier to manage and work with your projects.
The active working set is the current working set of projects that you choose to display.
A working set is created automatically when you create an application or library. When you select a working set, these working sets are enclosed by brackets, for example [Application1]. You can select, create, edit, and delete working sets in the Application Development view. However, you cannot edit the working sets automatically created for applications or libraries. For more details, see Creating a working set.