Didn’t try it myself, apparently you can get the size of a widget by using the Get Cached Geometry and Get Local Size nodes (plus casting to the widget and then dividing to get the radius) but that wasn’t what I meant by setting the radius of our sphere trace to the radius of the crosshair. It’s probably not just a thin circle anyway, but rather something with a design that surrounds the meaningful part. So just choose a debug type from the sphere trace node to make the traces visible (persistent makes it permanent once it’s drawn, for duration removes it after the desired duration, and for one frame makes it visible for just a single frame thus is only used when it’s drawn continuously) and play with the value until you’re satisfied with it 
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