I just recognized that my previous request is implemented already obviously.
I realized that MB was placed on screen 3. So MB offers to show the visualizer on Screen 1 and 2 or "Show in same screen as MB" actually thats screen 3.
What makes me confused is that the physical display order isn't in a row. Screen 1,2,3 are in the physical order 1,3,2.
I just was searching for screen 3 in the menu but that was the screen MB was running. So what i wanted to do was show the visualizer on screen 2 - the most right one.
No worry - that doesn't need to be understood
Greetings