How to scale a text box (frame) by value (I mean by reducing the % or value of width/height amount, not by dragging the node) and keep the text proportion (scale text inside by the same value)?
Now wait just a darn minute! I tried this little bit ago and it worked but now it's not.
It is a kind of solution with many "buts" :)
I'm surprised that the functionality of scaling text with frame is implemented but works only with Alt+ combination and not with values.
I think that the short answer might be, "That's not how Paragraph Text works in CorelDRAW".
But it does. You can scale it proportionally by dragging nodes.
I'm afraid you can't however you can hold Alt when scaling by dragging nodes. one problem though: if you have line spacing set to points then it will rescale text size but won't change leading and paragraph spacing. if line spacing is set to percent of line height or percent of character size then it will also rescale leading and paragraph spacing.