I bought Opus because (1) I have to deal with complex trees of information and (2) The preview pane is a dream come true. It's easy to get lost in deeply nested folder trees.
It would really help if we could adjust the indent for the subfolder descent. At the moment it is 1 character! It's so easy to get lost. If we could adjust the indent in the range 1 to 5 say, it would really help