If I turn on preview for blendedge/filletedge the preview appears as expected. If I turn off the preview, it no longer updates. I would love the preview to actually disappear when set to “No”. I find myself turning it off to better see the underlying edges and isocurves - not just to save time on preview calculations - but having to restart the operation to clear the preview from my viewport. Is this just my graphics card acting up, or is this how it works?