The emulator couldn't switch between different screens

Hi! There.
two weeks ago , I can easily switch between different screens with one emulator. But today when I open it. It always stocks to certain screen , but not the screen I am working on anymore, which is very strange. the stocked screen is like the image below.
But the emulator in my iphone is OK.
Do anyone know how to solve this problem?
I tried to delete the blocked screen (fruit). but same.
Thanks a lot!


See the screen switching section

Thanks! I will check that out!