Hi,
I too have the same problem, perhaps not quite understanding the full procedure of how to set up the custom Error 404 page.
I see there are two error 404 pages in the component, one in English and one in Italian, I deleted the Italian one.
When I looked at the coding of the English one, it's the same as the default Joomla Error 404 page.
I also created a custome 404 in article manager and entered the article ID into the redirect plugin and enabled it. But still the Joomla default error 404 page displays.
Can someone guide me through this procedure so I can do away with the default Joomla Error 404 and have a nice custom one.
Regards,
Paul