Rhino 6 Grasshopper can't show the preview of Edges on Brep?

Dear All,

I started pretty late, to use Rhino 6 and found the way of preview in Grasshopper is somewhat changed than Rhino 5 Grasshopper.

My concern is, that the Curves (like Edges) on the Brep doesn’t visible with Preview.

For Example, In the 1st. Screenshot the Breps are unvisible. If Breps are hidden, the GH shows the Edges correctly.

However in the 2nd Screenshot, where the Breps are showed again, then GH can’t draw the Edges correctly.

Is there any option, that I can see Brep Edges in Preview, although the breps are in Rhino visible?