Press Ctrl+Super+T and pick a wallpaper. That's how you're supposed to generate a colorscheme.
What appearance tab? I don't have such a thing. Do you mean in GNOME Control Center? That won't work.
Can't change volume using Fn keys: I'm not sure about that.. Does running wpctl set-volume @DEFAULT_AUDIO_SINK@ 5%+ work?
Icons follow your icon theme, so yes, it is the same as what you used before. If you want squircle icons like in my screenshot, get this icon pack: OneUI4
I have read the instructions and I have a problem with branch: illogical_impulse
The issue
swww img
).EDIT: just noticed icons do not work either, Files is using icons from my previous KDE install. Wonder if KDE is the source of these problems.