Hide buttons overlay (e.g. 5 second burst) on Google Camera
I recently had the same issue with my 6P, running 6.0.1 and the latest Google Camera version 3.1.021. It turned out to be a result of having the Screenwise Trends Panel app installed on all my phones. Enabling it in Accessibility Services causes the buttons to show up. From my searching there is no real solution other than to disable the Accessibility Service toggle for Screenwise. Then the buttons go away.