Version: 0.2 Web: https://github.com/Lightjohn/QtFileExplorer
If you feel comfortable with the column view in Finder, this is perhaps the best Linux alternative.
Rumour has it that once upon a time, the Dolphin file manager had support for Miller columns, but it was removed due to problems in maintaining the code. Miller columns are a kind of visual representation of a filesystem, where each subdirectory is opened in a new column next to its parent. While the way you want your directory structure to be shown is definitely a matter of taste, Miller columns view proved to be very intuitive for non tech-savvy computer users. Finder in macOS, Pantheon Files and Ranger in Linux support this, but we’ve discovered another application which is truly committed to such a column view.