Summary Views and Focus
Display Summary Level views of a project or Focus on a section of the WBS Chart
Expand and Collapse the Summary Tasks in the WBS Chart to show any level of detail. Choose to display all levels of detail. Like this:
Or collapse various Summary Tasks to show a high level view of the project.
You can also Focus on a particular level of your WBS Chart so that you can work on a certain section of your plan while hiding the rest. This is a useful feature for working with large projects.