LyX 2.4 Beta 2 — How to use dark theme on windows10 ?

[didiergabory at free.fr]

I use windows10. I naively thought that with version 2.4 it was now possible to activate the dark theme. But I can't find anything like that... Is there something I missed?
In addition, the color options (see attachment. Not terrible, especially with the mathematical macros in edit mode) that I use with 3.7 do not seem to work with this latest V2.4.

Failing a possible "activation", could someone share their "2.4 dark theme" color option file ? 

A big thank you to the entire development team for this absolutely great tool! 
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