Dell SE2219HX Software User's Manual page 13

You may use monitors with different models or resolutions in your daily routine,
and you may apply different window layouts on them. DDM is able to know the
monitor you have reconnected and restore application positions accordingly.
In case you need to replace a monitor in a monitor matrix configuration, you can
save the window layout before replacement and restore the layout after a new
monitor is installed.
NOTE: You should keep your applications running in order to
benefit from this feature. DDM does not launch applications.
Restoring Application Positions
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