Here you can choose the language for the user interface and the help system. If no help system for your native language is available, the English version will be displayed. You can choose the size of a tonemapped preview image created when clicking on a picture in the preview panel. It is possible to choose an interface theme among the ones available on your platform. You can also set if you want to always show the preview panel in the main window. Enabling the Portable mode will allow you to put the application on a USB stick with all its settings.