Hidden Lines v0.19

[Bingo]

I have just downloaded 0.19, been looking forward to the additional features in Techdraw in particular. I am having difficulty showing "Hidden Lines" in drawings. In 0.18 you changed hidden lines to True and the hidden line appeared immediately. This is not working for me in 0.19, please help.

OS: Windows 10 Version 2004
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.24276 (Git)
Build type: Release
Branch: releases/FreeCAD-0-19
Hash: a88db11e0a908f6e38f92bfc5187b13ebe470438
Python version: 3.8.6+
Qt version: 5.15.1
Coin version: 4.0.1
OCC version: 7.5.0
Locale: English/New Zealand (en_NZ)

[Bingo]

Not sure what went wrong but i have got it working now......thanks