French Drovak layout : BÉPO

hello bépoètes and keyboardio lovers,

I received my Keyboardio yesterday and could flash it with your keymap @Celtic. thank you very much, I find it very comfortable.

I have one question regarding the alt + fkeys combinations which is the only thing
I miss at the moment, working on Windows.

I found this thread Alt key combinations on Fn layer but I do not know how to make shortcuts such as alt + f4 to work.

Activating the num layer and pressing alt on the left thumb arc + f4 does not work for me.

thank you !