Try this:
First make a full backup of the current state of your desktop with:
dconf dump / > desktop-full-backup
Make sure that a file named desktop-full-backup is really created. Run ls and/or cat desktop-full-backup to view its content.
Remove this package: eos-settings-gnome
sudo pacman -R eos-settings-gnome
Now you can reset all the desktop configurations with:
dconf reset -f /
Please note that this command doesn’t reset just Gnome desktop settings, but also any application that stores its settings using dconf.
See if you can build things up from there.
You could always restore the settings to what was before:
sudo pacman -S eos-settings-gnome
dconf load -f / < desktop-full-backup