TB Theme edit font+tree

[Alex]

Hello,

I hope I am here right and someone could help. I saw that here is not so
much posts.

I have to edit an theme for my own usw. I have an theme in which are the
number of unread mails is right from the foldername of closed main
folders. In which file I can edit to hide this ? Or is it an setting in
TB ?

I want to change the font typ of some parts from the theme like tree
maillist menu and so on. In which files I have to do this ? Or is there
a file in which is set a standard font which I have to edit ?

sorry for my bad english hope you understand what I mean and maybe can help.

Thanks

Alex