Did something change on the SM module, using Edge Flange, you used to be able to Add your edge flange, then drag the length of flange to other flanges length, by holding Shift or Ctrl key,
That seems to be broken now
I use Up to Vertex for that, then again only if I can't or don't select multiple flanges for the operation. I have never dragged a flange. I imagine you need Instant 3D turned on, maybe that is what you;re looking for.
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