It is not a flaw. It is the way it is. VL Light is not, nor does it pretend to be, mswindows.
To go back to the way it was, Click Menu > Home. Pcmanfm will open. Click Edit > Preferences > Desktop tab, un-check box for "Show menus...", click OK.
The menu is defined by text files in the ".icewm" folder in your home dir. Note the leading dot, which means that it is normally hidden from the file manager. In pcmanfm, click View and check box for showing hidden items.