I am using Kubuntu 10.10 with Plasma-Netbook on my netbook. Somehow I messed up with window's settings and now the menubar (the one on top of the window, just below the titlebar, which has the File button, Edit, Settings, Help, ...) is hidden from all my KDE applications.

Here you can see how the menubar should be correctly displayed:

Here you can see how it is actually displayed on my netbook:

I don't remember what I did to hide the menubar, I clicked somewhere in the context menu which shows right-clicking on window title, but I cannot find that setting anymore.

Can you please help me? Thank you very much.