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Where is this widget in code..?

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Where can I find the code for this badboy in the Engine?

Source/Editor/IntroTutorials/Private/STutorialButton.cpp - When you need to find the source for a particular icon/button/widget. You can use the Widget Reflector, isolate the widget in particular and view the source for when it is being added, from there you should be able to find all the logic.