This is an alternate 404 error page which you can customize, I have included some images for 404 error pages I made for you to try. By having a Custom 404 error page, people can easily navigate back to right place without having to hit back on their browser. Your Custom page will match your site theme.
Makes it easier to differentiate between bonk error types.
The Link to the page only appears to the administrators and not the users.
You will need to Route this page, in the dashboard go to Routes and edit what is there to:
Default404 = plugin/Bonk
Type= Not Found (404)
you can see example here:
notice that the link has a bad address on purpose so you can see the routing in action.
or type your own wrong address ...
Tested on 2.2