[saltymug76]

Looks like they added an option for split view in dolphin if that's what you mean.

[veidr]

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...

[jdright]

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

[alpaca128]

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