Thanks Barry, appreciate it.
The directional drag difference is apparent and works as expected when dragging modules vertically - but not when dragging horizontally.
Despite the promotion of the tool being about it being intuitive and easy to learn, I find it fiddly and difficult to remember which settings are required for the desired outcome - though it is very versatile and capable of producing exactly what I need (eventually), which the Archicad tool certainly won't do. I am beginning to suspect a bug, but was hoping I had missed something simple and probably obvious to someone else - just not to me! Something like direction of drag as you suggested, or a way to re-set the default module type, or a setting required to bring up a different hotspot for dragging. In the end it seems that it's best to just rebuild the drawer module.
AC26 Australia, Windows 10