@betro-hakala I don't even know what you want to be transparent. Also, if you are using Vanilla theme (not Persona) then the theme's options won't be in NodeBB Category options, those are completely different.
Could you send a screenshot of what you want transparent? That would help us help you.
"Home" to remove the article
Now in: Home - Nodebb
I want to: Nodebb
Tricky, since the actual page titles are hardcoded here, but you can modify this file on your local install...
Issue with removing it there is you'd end up with
| Node BB