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This is Libadwaita not GTK3
*sigh*
It’s GTK4, libadwaita is just their really weird theming stuff, but the UI toolkit is still called GTK, and version 4 of it forces you to use libadwaita. You can’t change the theme, because Gnome is actually user-hostile.
You can use a different theme with GTK 4 (not that you would want to)