Screen Color dont change- need help (and a black screen)

Hey there,
I’ve got an problem with changing the screen colour in my experiment.
Every time I try to change nothing happens. I am at a loss.
I tried Screen- Colour- (choose colour)- insert…- is there another way?
Can anybody help me?

Do you want to change the color during your experiment, or just change it to something different to the default? The window color is in Experiment Settings, or you can change it in a :code: Code component by setting win.color