To view a delegated calendar in a separate window, you would right-click it and click Open in New Window. If you wanted to hide your own calendar, you would clear its check box under My Calendars.
If you don't want to see the boss's calendar in your own Outlook window, or if you just want more room to work in, it's easy enough to view it in a separate Outlook window. You would do this from the Navigation Pane by right-clicking the boss's name under Other Calendars and clicking Open in New Window.
You'll get a chance to view a calendar both ways in the practice session at the end of this lesson.