This does not work on Android 9 Pixel XL 3. As the back button is not visible. Found that swiping up from bottom of screen brings the back button back. However TeamViewer does not reliably detect when you need to type so it's a constant game of swiping up from the bottom of the screen to bring the bottom TeamViewer tool bar back to show the onscreen keyboard button. I really think team viewer need to review and develop the way this works. It's not right or productive.
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