Dell UltraSharp 49 U4924DW 49" WQHD Ultrawide Curved Monitor - Manual (Page 44)

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Setting up the monitor
4. When using as dual monitor stacked on top of each other, set up must comply
to the recommended panel orientation and working angle, as shown.
NOTE: In double stacked scenario using 3
rd
Party Arm, the top monitor
should not be rotated 180° (landscape). The monitors should not be
orientated at 90° (portrait).