✨ UPDATE ✨
I believe this API has been exposed through the preferences menu now, so no need for fiddling with the "pseudo" freecad registry.
https://gist.github.com/ipatch/611682...
also, make sure to download the latest stable version of freecad from the github releases page. link below,
https://github.com/FreeCAD/FreeCAD/re...
as of this writing (april 22, 2021) freecad v0.19.1 is the latest release
A quick explanation of adjusting the size of the Navigation Cube inside of FreeCAD.