BooleanUnion and/or Stretching

Can anyone tell me how to not display these lines after Joining, Stretching or Boolean?
I typically present these with Show Surface not visible, but it does fix this issue.

Thanks,
Frank

LT33.pdf (81.5 KB)

On objects with co-planar surfaces you can try MergeAllFaces… --Mitch

That’s it Mitch!
Thanks