Just as the title suggests. How can I convert a new form designer form into a classic one? I remember seeing in some older documentation that this was possible.
You cannot convert a form built with the new designer back into a classic form. You can create a new form with the classic designer and bring the variables onto it, but it cannot be converted. As of Forms 11 update 1 (released yesterday), you can convert classic forms to the new layout designer. We only support converting forward, not backward.