Great question, and something I’ve never noticed before. I’m not sure you can use the other side of the protoboard. IE; display the solder side. I don’t think that is possible in breadboard view. You could use a double-side protoboard in PCB view and maybe accomplish what you are trying to do. But that would be counter intuitive to producing a final PCB for your project.
Sorry I can’t respond in German. Good luck with your project!!!