Sounds like a fair request.
How would you want the hidden list(s) revealed — a button combination on the panel, or something like a key on a separate keyboard you keep out of reach? (Kids tend to find button combos quickly.)
And should the lists go back to hidden every time MaLa starts, or stay revealed until you hide them again?
Well, of course there are many ways to do it.
Maybe give each list the option to hide until unhidden, in options/configuration.
I guess my suggestion to unhide would be a 1 to 3 button press. (User to select what button(s))
Example: 1 + 2 + 3 would unhide the hidden lists.
In my scenario, the button press could be just one button, which would be assigned to a input im not using on my CP.
Then I could hide the button behind coin door or somewhere.
I know this would be a pretty hard request, because if more than one button press is required, timers would have to be involved.
It would be a lot simpler, I think, to have only one button (keyboard encoder input) assigned as the key.
Maybe press button again or quit mala to re-hide the lists?