The Screen Saver setup dialog is comprised of three sections:
The screen saver Preview Monitor.
The global screen saver Settings.
The choice of Screen Saver program to run.
This is a minature representation of your screen saver, using the current settings. To apply these settings to your display, press the Apply button to continue using the KDE display setup utility or Ok button to apply your changes and quit.
In the corners of this monitor are four grey boxes. These boxes indicate what action to take if the cursor is left in one of the corners for more than 5 seconds. The options are:
Ignore - take no action
Save - invoke the screen saver
Lock - lock the screen
To select an option, place the mouse over a grey box, and right-click; make your choice in the dialog box that opens. If the Save or Lock option is selected, this is shown in the corresponding grey box: ("s" = Save, "l" = Lock).
Note: Pressing Ok or Apply applies changes made in all of the display setup modules.