Add a function/pane title bar

Please would you consider adding a title bar to the app to indicate what the functions/panes are?

I found it confusing to see an apparent list of apps & their functions along with a "Preview" function. Preview what exactly? Also after I hesitantly used the Preview the right pane contained a long list of Delete file entries, though some prefixes said Vacuum, Clean and Overwrite, though I've not been able to find out their exact meanings.

When I read the docs, I then understood that those "apps" were in fact "cleaners" and then things started to make more sense.

I know the fashion is for a (ahem) "clean" UI, but if an app is not in daily use then it's far more useful to have unambiguous descriptions of what the app pane layout and functions are, particularly where potentially destructive file deletions are part of the functionality.