Dell S2421HS User Manual page 13

If you are using multiple displays in an array or matrix, Easy Arrange layout can be applied
across to all the displays as one desktop. Select "Span multiple monitors" to enable this
feature. You need to align your displays properly to make it effective.
S2421HS/S2421HSX
S2721HS/S2721HSX
Organizing Windows with Easy Arrange
Dell S2421HS/S2421HSX
Dell S2721HS/S2721HSX
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