Why is my terminal so bland (bash) and I can't switch to zsh like the default in new install?

My PC is running Manjaro 26 (updated). I installed it in 2019 or 2021, sometime around there.

Today I used a live Manjaro usb and the terminal has cool default features I did not know about... but I don't have it in my main install. I do not seem to be able to switch.

When running `chsh -s $(which zsh)`

I simply get a "can't modify" type error.

Please help. I never used anything else then bash and the default terminal.