First，are your three text blocks three
Actors or three Widget Components in
one Actor ?
One actor, one widget component, one widget - this widget has a horizontal box and 3 elements in it.
how many WidgetInteractions did you
use？
One.
Third，WidgetInteraction has no
DrawSize，
Widget Interaction is an input method, it does not have dimensions, per se. It does not really exist in a physical space. It’s a method of emulation for the mouse / controller where traditional input is of no use.
how to make the response area
of the click event of the
WidgetInteraction just cover the
curved TextBlock shape？
The interaction traces from the camera towards the pointer projected into the world. If the trace does not hit the widget’s quad mesh, nothing happens. No additional setup is required here. Perhaps you’re referring to the Widget Component itself - it does have Draw Size and it can be adjusted in its details panel.
I tried it in my project but faild.
Maybe something wrong in my way.
We’ll never known unless you post details. Consider creating a new thread and feel free to @Everynone me, I’ll try to chip in.