Removing the input box above the native keyboard?

Hi,
I was wondering if anybody had figured a way to remove the input box that automatically displays above the Android/IOS native keyboard?
I know there is ‘Hide Mobile Input’ checkbox but this seems to only work using the ‘single line’ keyboard and does not work for Android. I want to get rid of this due to adding my own input box above the keyboard.

I have attached an image of the issue.
I hope someone can help…

Thanks

have the same problem