Now things are getting weird!
Just after posting that things had changed, I realised they hadn't. It turns
out that if I go to the system setting through the main menu, I get a limited
set of functions (see attachment to my first post). If I, on the other hand,
click on the battery icon in the panel I get an option to enter power
management. But I am not send there directly, rather I am send to the system
settings, now the full version!
Any suggestions on what is going on and how I can get access to the full set
of functions via the main menu?