Windows can be displayed or hidden at any time using the menu item View > Windows then selecting or deselecting the window, or by using the buttons in the View Toolbar.
The layout of windows within your workspace is customizable; they can be docked, undocked, put into tabs, and moved around. The show/hide state of each window is preserved between invocations of the tool.
The currently active window is distinguished by a differently colored title bar. Input key presses are sent to the active window first.