Egg, I hope my second try is clearer.

The Grouped green box is smart and can be stretched or squashed. All fine.
I expected the same behaviour with the Soft-grouped red box but all I can do is scale.

The orange A4 ratio template ought to behave like the red box and fails in being purely A-scalable.

Amended file: v16dot1 - Smart Line Groupings.xar

I have engaged Show select bound handles (black, traditional Xara controls).

Acorn