Total Commander

On this screenshot you can see three alternatives how a separation of controls inside of groupboxes could be realized.
http://ghisler.ch/img/groupbox2.gif

The alternatives
- A groupbox inside the groupbox
- A horizontal line
- No visual separator.

Choose your favorite


You can read the original discussion here:
http://www.ghisler.ch/board/viewtopic.php?t=11036

in this case (fonts) none - but i'm not sure how would it look in other parts of the configuration menu,

In this case (fonts dialog): horizontal line.