Kivy webview about youtube

[CZacVV]

Hi , I'm Youtube channel fan .
I turn a webview apk install on my phone , and open this page.
--> https://support.google.com/youtube/answer/171780
webview app youtube embed fullscreen button is disable , do you know how unlock it ?

apk install

open app

Kivy webview open youtube embed page , fullscreen button disable .

Android Chrome open same page , youtube embed fullscreen button is normally.

[Android-for-Python]

No idea
Webview is part of Android WebViewA = autoclass('android.webkit.WebView')
I'd suggest searching the Android documentation.