How to remove collapsible area line while generating PDF in MATHCAD Prime 9.0.0.0

In Mathcad (version 15 and below) you could do so, but in Prime unfortunately you can't.

Maybe it works if you overlay the line with the picture of a white rectangle. Don't know if Prime would allow to position the graphics that way, you'll have to give it a try. If it works, thats sure still  awkward and undesirable .

Maybe a future version of Prime will have the "power" to edit the look of a collapsed area, hide the line, add a label, etc. as we were used from old Mathcad.

Prime 10 now offers the feature you request - hiding the line.

Unfortunately still no way to show a border, highlight the area itself, assign a name for the area which is displayed or automatically apply and show the date of last edit ...