View Through Added Camera(s)

New to Composer. I'm not seeing how to change the default viewport "camera view" to look though an new, added camera. I can select the camera and move it around, but can't see what it's pointed at or it's lens angle of view (as set in the Advanced page of On Demand Properties), etc. Why isn't this simplest of features under the right-click menu?

SolidworksComposer