Are you using the camera in landscape mode or portrait mode? When you are in landscape mode, does the arrow next to "More" disappear? If yes, you should be able to scroll down to find further options.
I have this exact same problem. I get the "More" button but after pressing it nothing comes up. After some further investigation it seems that the additional settings are there but aren't visible. If I scroll all the way down and press in the "empty" space I get a prompt about activating touch block.
Which phone models are you guys using and also, which build number does the phone have (Settings > About phone > Build number)? Which language is being used in the phone? If you have changed the Theme in the phone, could you try a pre-installed Theme?
I got the advice from another forum that enabling the animations in developer options corrects this problem. I had removed the animations and after putting them back on the problem seems to have dissapeared.
I will forward this as well. I do not recommend that you change any developer options since they are intended for app developers. The options are not intended to be used for general usage.
