gthumb preferences

[drstilpunkt]

Dear all,

I working with a Raspberry PI with Raspbian (Debian Jessie) and gthumb 3.3.1. I want to make a slideshow. Sadly I cannot find the preferences of gthumb, where to change the config for the slideshow. Attached you find a screenshot of the program (sorry cannot upload it, got "Interal Server Error", I still check all buttons, but there are no preferences. Where can I find the preferences? Do you maybe know where I can find the configuration file, so that I can make changes there?

Thank you for help and best!