How can I make all shadows equal intensities or values on all sides? Seems like it’s only biased to the bottom. Also, I think there is also a black shadow, how do I remove it? I’m using Breath Dark.
If you alter the code for Breeze Windows Decorations.
Anyway, what you try to achieve was called Glow actually, not Shadow, and KDE Plasma 4.x had some themes done like that, here is an example: Tenuto-Light-ActiveGlow Aurorae theme - KDE Store
That Aurorae themes code was dropped AFAIK, but maybe you can use the Oxygen one …