Hi Fabian,
Do you by any chance have optimization turned on the for the electricity module? Turning on optimization removes the Historical Production tab from view. If this is not the case, I've noticed that switching from the Results or Notes View back to Analysis View resets the visibility of variables. If that doesn't help, if you could provide more information, like a screenshot of what you are seeing, that would be helpful for us to reproduce the issue on our end.
Thanks!
Emily