Hi Lloyd,
Thanks for reaching out!
You should be able to remove the Site Title block by navigating to Appearance > Editor > Patterns > Header. Once you’re able to edit the header, you can simply click on the title and delete it.
As for the header background, you should also be able to set this in the block options in the editor. However, I may need some more context here. Can you provide a link to your site, and some screenshots illustrating the issue?
Thanks!