From the menu bar, select File > Exit.
On the title bar, double-click the 
icon, and then click Close.
Use this procedure to quit the SAP CC Core Tool user interface.
To disconnect from Core Tool
In the main window, do one of the following:
From the menu bar, select File > Exit.
On the title bar, double-click the icon, and then click Close.
The window closes and you are disconnected from the distant SAP CC system. Your user session ends.