- Edited
Install Dconf Editor, go to /org/gnome/nautilus/
and check the toggle Use default value
everywhere
^ here is (!) non-default setting
old link: https://askubuntu.com/questions/697739/how-to-restore-nautilus-default-settings
Next steps you can try:
- remove Nautilus
- reinstall Nautilus
- check broken packages https://getsol.us/articles/troubleshooting/general-troubleshooting/en/