QT Widget Android applications UI absnormal

When I used the QT Widget to develop Android applications, I found the following situations:

• Expect to control whether the menu is visible.
• The menu display is incomplete.
• Expect to control whether the editing toolbar is visible.
• The cursor appears where the individual thinks it should not appear, such as the cursor appears in the combo box, and the position is inaccurate.

QT 5.10.1/Android 9(also in lower version)/The mainwindow is fullscreen state.

screenshot link

https://forum.qt.io/topic/106617/qt-widget-android-applications-ui-absnormal

I'm not sure if it belongs to BUG, but I expect to be able to control the visibility of these elements that I think are exceptional, and they're not the result I want.