You can log out of your KDE session by using either of the following methods:
From the Main Menu, select Logout.
From the desktop, right-click on the desktop and select Logout from the menu.
Figure B-12. KDE Logout Screen
At the logout screen, KDE offers you the chance to save your current settings, which will preserve your Panel configuration and start any applications that you left open in your session.
If you are working in an application and you have not saved your work when you log out, a dialog will inform you that you will lose your unsaved material when you log out. When you see this dialog, you can simply select the Cancel button, save your work, then log out again.
If you log out without saving your work, you will lose the unsaved data.