no visual cues for exiting settings view

touching the tab at the bottom of the live preview window brings up the camera settings. The background live video is blurred to show you are in the settings view.

However, having changed a setting, the window remains blurred, presumably to allow the user to make other changes. However, there is no visual clue as to how to "hide" the settings view (get rid of the blur) and return to the live camera preview.

All you actually have to do is touch a part of the blurred image to hide the settings but there should be some visual clue to do this; the settings view is initiated by dragging a tab so maybe that tab could persist so the user has something obvious to touch?