[Qt-interest] How to change the default value for layoutSpacing in Designer?

[Robert Hairgrove]

The default value for layoutSpacing of layouts is 6, but when designing
some forms which have a lot of controls and layouts, this ends up
wasting too much screen space. I know that this can be changed on an
individual basis, but I would like to change the setting globally to 2.

Does anyone know how to do this?