I would note where this is one of those things about which I wonder, "Why change that?"
There is nothing wrong with the new way of doing it, but there are a large number of users who have been Mathcad users for a long time and who have gotten used to the controls that have always been there.
As I said, there is nothing wrong with the new way of changing from one side to the other [well, the menu method is awkward, but the new keypress is OK] but why change without a clear reason to do it?
This item is not unique in this category. Many things have been altered, not all with obvious cause or benefit. Or am I missing it?
Mike