Enable ALPHA_BLENDED_WINDOWS(EWindowTransparency::PerPixel)

I want to have per-pixel alpha blended transparency window in my game ,but when it comes to package ,ALPHA_BLENDED_WINDOWS is being define IS_PROGRAM || WITH_EDITOR. i used source build and change it to IS_PROGRAM || WITH_EDITOR||WITH_ENGINE, but it doesnt work?How to ?

That’s a lie.That is about dwm. It is not about transparenct windows