How Can I Completely Reinstall Arch Linux?

If you can access a terminal or the login screen, you might want to try installing a basic desktop environment like XFCE first. After that, you can log out and log back in to the new desktop session to fix your theme issues from there.

There isn't an official 'factory reset' feature for Arch, but essentially, you can do a complete reinstall by wiping everything and starting from scratch. If you can give us more details about what you've changed, some others might have suggestions on how to repair things without reinstalling.

If all you want is a fresh install, that's totally doable! Just uninstall the existing setup, and then follow the installation guide for a clean slate. Super straightforward if you're aiming for a new start.