Cause: The iwd or NetworkManager service isn't running.
Solution: Enable networking services.
sudo systemctl enable --now iwd
sudo systemctl enable --now NetworkManager
Documentation is sparse
Software Compatibility Quirks
No Secure Boot support
Update caution required
Because Onyx is pure Arch, you can install the full DE exactly as KDE intends. pure onyx install
# Pure KDE Plasma
sudo pacman -S plasma-meta konsole dolphin
visudo