How do I remove the "Undo" popup when deleting a file in Nautilus?

I "removed" it doing this way:

  1. Go to ~/.themes/THEME-IN-USE/gtk-3.0
  2. Open gtk.css and add this at the end:

    .app-notification { padding: 0; margin: -80px 0 0 0; opacity: 0;}
    

    and save.

  3. Refresh theme in GNOME Tweaks (change to another one, and again change to your theme in use).

Now you can't see the popup.

Tested on Nautilus 3.26.4, GNOME 3.30.1.