Use the File menu in the Inspector window to exit from the inspector. (You can also exit from the Inspector window by clicking the close icon at the top right corner of the window, or by selecting the Close command from the Control-Menu.)
To exit from the Inspector window
Click the Close command on the File menu.
The Inspector window is then closed.
To close all open Inspector windows
Select the Close All command on the File menu.
All open Schema Inspector windows are then closed.