Delete files/Move to trash: when Krusader deletes files it can either 'really' delete them or move them to the trash folder, thereby making them available via KDE's trash.

Use mimetype magic: mime type magic is a mechanism which allows Krusader to inspect the files in the panels and determine their type even if the file has no identifying extension. For example, if you take an image file - 'image1.jpg' - and rename it to 'image1', Krusader will still know it's an image file and work with it accordingly. However, this mode of operation is slower (while refreshing the panel, or changing directories), so try Krusader with and without mime type magic and decide what is best for you.

Editor: choose what editor will be used when editing a file (via F4).

Default viewer mode: either generic, text or hex mode.

Viewer opens each file in a separate window: you can use the browsing tabs for navigation.

Atomic extensions: predefined atomic extensions like tar.gz are shown as one part in the Ext Column of the List Panel.

Terminal: choose which terminal emulator will be used when Krusader opens a console window (via F2, or Commands->Terminal menu option).

Terminal Emulator sends Chdir on a panel change: if unchecked, there will be no cd command sent to the Terminal Emulator if the panel folder changes.

Temp Directory: this option selects the base directory for Krusader's temporary files. The actual files will be created in separate directories under the 'Temp directory', so that each user running Krusader will have their own temporary subdirectories under the chosen directory.