Solved! I hadn't set Gnome to startup automatically, so when you login to Arch Linux using your standard root login. Check that gnome is installed and works (Use: xinit gnome-session
).
Create an account by going to Settings, Users, Create the account as Administrator. Logout of Gnome Log back in as root to your Arch Linux CLI Use the command: systemctl enable gdm
The next time you reboot, you should be presented with the Gnome Login screen.