I've already disabled the "Snap" feature in Settings => System => Multi-tasking. This turns off docking *within* a single monitor, but does nothing to disable docking of windows dragged from one monitor to another. EVERY time I drag a window from one monitor to another, it docks.

I have also checked the relevant registry key and it is properly disabled, but that is not helping.
HKEY_CURRENT_USER => Control Panel => Desktop => WindowsArrangementActive = 0

HOW DO I DISABLE THIS FEATURE?