Board Thread:Support Requests - Designing Your Wiki/@comment-46743250-20200922214353/@comment-168424-20200922230241

I wonder if Theme Designer can explicitly affect Discussions without affecting the wiki side... I doubt it. From the preview, you can't see what it will do in Discussions anyway.

It might be best to contact FANDOM staff and find out if they have any future plans for more or better Discussions customization.