So … I am using 2 monitors at work. One of them start flickering a couple of days ago and today we decided to send it back for replacement. The problem now is that some of my Applications are still opening on the second monitor (that is missing now).
I tried different solution and I found one that is quite simple.
Just press windows key and press the arrow key one or two times.
The Program Windows will be moved back to your screen. Have fun!