1 Right-click on the column headers (Name, Size, etc.). 2 Unselect all. Now there is no place to click that will bring back the columns. Reset Layout does not reset back the columns. Reproducible: Always Actual Results: Expected Results: Either it should not be possible to disable the column "Name" or right-click anywhere should enable to configure the columns or "Reset Layout" should reset columns.
Why on earth would you erase all columns in the Files Browser? Sounds like an extreme corner case to me... But I can confirm the bug, this is indeed annoying, even if not many people will probably do that. The problem can also be solved quite easily: in your ~/.kde/share/apps/amarok/ folder, erase the file named file_browser_layout. This file is only created if you change anything in the Files Browser settings, erasing (or moving) it solves the issue.
FWIW: the option to reset the Layout is meant for the GUI elements of Amarok only.