Hi. The theme includes a couple of custom 404 pages, so I have made my own custom 404 page and want to use that but how? I tried to give it URL 404 (https://www.facepaintworld.com.au/test-site/404 ) but it gets changed to 404-2 because the default 404 still exists. But where is it to delete? The default 404 page isn’t listed under Pages. I can’t see anywhere or anyway to change anything so that my custom 404 page comes up instead of the default one.
Please make sure that page is not under the pages also in trashed pages. And then try and set the page you want to set as Custom 404 page under Theme Settings >> General.
If the problem continues then deactivate all third party plugins and provide with the admin panel login details to check it myself and help you out accordingly.