System Boundary shape

In a use case diagram, the system boundary is a boundary surrounding the use cases which indicates the system.

Resize a System Boundary shape

Select the shape, and then drag a selection handle.

Rename a System Boundary shape

Select the shape, and then type the name you want.

Move a system boundary and the use cases it contains

Drag a selection rectangle around the System Boundary shape to select it and all the Use Cases, and then drag the shapes to a new location.