A full-featured columns view, like that of macOS (but also implemented by various file browsers over the years), has an arbitrary number of resizable columns. Perhaps optionally with a preview pane at the end where the last column would otherwise be.

You can get the gist of it from this Super User discussion: https://superuser.com/questions/1141631/make-windows-10-file...

not sure what he means by columns either. but split view on dolphin exists for many years already.

Probably the three-column view where you see the parent folder, current directory and selected folder's contents side by side.

it goes more than 3 columns, its more like drill-down view and very handy... its something i miss from macos too

https://www.lifewire.com/use-finder-views-on-mac-2260734