Click the button to enter the full screen state?

[or_s]

When playing the game, click the button to enter the full screen.

Is there such a program statement?

[Alpha2020]

Do you mean to hide the status bar??

[Alpha2020]

You can use this -

for hiding the status bar

[or_s]

How to hide buttons?

[Taifun]

Try the HideSystemUI method from the tools extension
http://puravidaapps.com/tools.php

Taifun