It still did not work out but thanks you anyway.(while switching screens it shows for milisec other screens or it jumps to the wrong screen.)
I also tried Close application problem: In multiple screen, when I go to another screen, then back previous screen and press EXIT button. But it is not working properly - #3 by Anke
Same results.
Will use second method hide and show the canvas's.
Here the link if u curios how the whole projects looks so far.(where the issue is appearing with the screens are not closing properly)