I am a new Mavic 2 Zoom owner. I'm also using the Smart Controller with Go4 app version 4.3.16 and want to bring up the histogram on the screen while I'm flying. I have the drone set to P mode and camera settings are in manual mode. I can slide the histogram setting to green but the histogram doesn't show up on the screen and when I go out of the camera settings the slider always turns off. If I adjust another setting within the manual settings screen, like add grid lines, the histogram slider turns off but the grid lines remain active. What am I doing wrong? Many thanks!

Ok. I figured it out. For the histogram the slider doesn't work. I pushed on the settings and now it shows up on the screen.