To work properly, the touch interface widget created by Touch Interface Designer must receive inputs on the entire surface of the screen. This is necessary for gesture management and other functionality. If the touch interface is placed on top of a UMG widget, then this widget will not receive any inputs because they will be captured by the touch interface widget. It is easier to design the user interface by placing the touch interface widget below all UMG widgets. Just keep in mind not to obstruct the layout components with your UMG widget.
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