Dell SE2219HX - Span Multiple Monitors Feature; Zone Positioning with Shift Key

Organizing Windows with Easy Arrange
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SE2219H/SE2219HX
SE2219H/SE2219HX
If you are using multiple monitors in an array or matrix, Easy Arrange layout
can be applied across to all the monitors as one desktop. Select “Span
multiple monitors” to enable this feature. You need to align your monitors
properly to use it effectively.