I'm running KDE Plasma version 5.12.8 under Opensuse Leap 15.1. The following problem was no issue in previous versions.
When opening a document with some applications, i.e Okular, a standard window appears with a list of documents that can be opened by this programm. It shows three columns: Name, Size, Date (in my case). Where can I change the setting such that I only see the Name column? I couldn't fing it in 'Configure Desktop'->Window Management nor do I get a choice for setting when clicking with the right mouse button in the title bar.