Does not go fullscreen on Windows

[MariusDrulea]

I do use the app on both Ubuntu and Windows 10. Works perfectly in Ubuntu, when the timer ends the fullscreen is taken and I'm forced to take the break. In Windows 10 however, the application fails to go fullscreen when the timer ends. And I have to click on the app one more time for this to happen - see the highlighted pomatez icon in the picture bellow.