There’s a number of themes that cut down padding (just take a look at the GTK Themes section of gnome-look) but two where it’s more obvious are the Nordic and M

There’s a number of themes that cut down padding (just take a look at the GTK Themes section of gnome-look) but two where it’s more obvious are the Nordic and Mcata themes: https://www.gnome-look.org/p/1267246/ https://www.gnome-look.org/p/1267246/ https://www.gnome-look.org/p/1381832/ https://www.gnome-look.org/p/1381832/