I have been getting overlays as such on my Nexus 5, Nexus 6 and now my Nexus 6P - haven't noticed exactly when they start to appear and have yet to find a way to disable them - please take a look at the following image:
Screenshot (click to enlarge)
If you look at the upper right, you should notice a few buttons on the viewfinder. It used to be just two, now I have three after the camera app updated. They were not there when I initially got any of my Nexus devices but shortly presented themselves afterwards.
I do use my Nexus devices for debugging so I have disabled debug mode to see if there was any connection, but this does not seem to be the case.
Is there sort sort of hidden button I must press (ex; how the developer menu is activated) in order to hide these buttons once again?