Kivy using Raspberry pi 3

Question

I’m using HDMI output from Raspberry Pi 3. Using a code Python that opens a window Kivy, this window fills the whole screen and overlap everything else(open windows, pointer mouse...). Apparently he(rasp) responds to commands as it is possible to turn off, but nothing can be done in the window. How can I correct by using it normally?

import kivy 
kivy.require('1.0.6') 
from kivy.app import App 
from kivy.uix.label import Label 
class MyApp(App): 
   def build(self):
      return Label(text='Hello world') 
if name == 'main':
   MyApp().run()