Android 8.0 constantly is hiding the back button before I am finished using it, because it requires more than one press, but hides after the first press on the heads-up view (when Textra temporarily overlaps all other apps). The built-in back button on Textra is at the very top left, completely away from where the thumb is, so I have to switch hands and fingers everytime I want to exit Textra, which is annoying enough to make me want to look for other apps. This is happening every hour. Please integrate the ability to move the back button to the lower left of the screen! Thanks.