Gradience mainly changes the looks of libadwaita applications and it only work on gtk3 and gtk4 apps if you use the adw-gtk3 theme.
There is an important difference between gtk4 and libadwaita. While libadwaita apps use gtk4 in the background, they cannot be themed through normal gtk theming.
I don’t know of any way to change the compactness of gtk4 or libadwaita, sorry.
Gradience mainly changes the looks of libadwaita applications and it only work on gtk3 and gtk4 apps if you use the adw-gtk3 theme.
There is an important difference between gtk4 and libadwaita. While libadwaita apps use gtk4 in the background, they cannot be themed through normal gtk theming.
I don’t know of any way to change the compactness of gtk4 or libadwaita, sorry.