Is there a way to use the default Directory Opus 11 icons on Directory Opus 12? I would also like to have the Windows 7 look on the relative size on disk column.
You can use the Opus 11 icons, but they don't have any connection to the size graphs.
If you set Preferences / Display / Colors and Fonts / Graphs to a darker shade of blue, it will look a bit more like your Opus 11 screenshot. I am not sure it is possible to get them looking exactly the same as I think we may have changed the algorithm slightly, but you can get it looking quite similar.