the attribute ScreenOrientation exists to compensate eventual rotation how the display will be installed in your resulting product/device. During the Prototyping the attribute has no effect (it is forced to the value Normal) ensuring that the GUI application does appear arranged similarly to what the user will see in the final product. In other words, during Prototyping the GUI does not appear rotated if ScreenOrientation is other than Normal. This special behaviour during Prototyping is mentioned in the documentation Member attributes: ScreenOrientation.
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