Panasonic Toughbook CF-18BCAGCMM Reference Manual page 72

External Display
Precautions
When the application running is not shown on the display, refer
to the following items.
When the application is in the external display, or after the application is closed in the
external display, there are cases the application will not be shown in the display when
executed the next time if the position of the extended display is changed or the Extended
Desktop is closed.
When there is no display after the position of the extended display is changed:
The application running is being displayed at the position of the extended display before
the change. Return the position of the extended display to the condition before the
change. Move the application to the internal LCD, and then correct the position of the
extended display.
When there is no display after the Extended Desktop is disabled:
The application running is being displayed in the external display. Set the Extended
Desktop again, move the application from the external display to the internal LCD and
then disable the Extended Desktop.
To prevent images from being burned onto the external display
Manually shut off the power to the external display when not in use.
When the display domain for the Extended Desktop is changed,
the wallpaper and icons may become displaced.
Wallpaper: Change the setting for the wallpaper.
Icons: Right-click on the desktop, and select [Arrange Icons By] - [Auto Arrange].
72