Keyboard issue it's close while typing

In config.xml if i set "preference name=‘Fullscreen’ value=‘false’ "

  • when focus on inputbox, keyboard show and push up inputbox above it if start typing just one character or scroll page keyboard suddenly close.

In config.xml if i set "preference name=‘Fullscreen’ value=‘true’ "

  • keyboard seem work fine but cannot scroll page and it overlap and hide inputbox