Dear Xara...

I can see the benefit for using the auto-fit text feature though the Interactive size already does the job with the designer in full control. Making it behave across Variants will be interesting.

It is buggy.

If I fill a simple text area with Lorem Ipsum text, all well and good.
If I select all the text and then apply a font size, the presented font size in the Size box can take on make decimal variations; none seeming change the text.

If I change the text area to a text column, the text size shrinks until the mouse is released and the size bounces back to the Size value at the start of the shape change.

Acorn