If you activate a toggled menubar (Settings->Preferences->Menu Bar->check box "Hide (use Alt or F-10 key to toggle"), then close the Preferences window, you will not have a menubar. There are two known options to regain the menubar. (Bug 21918)
Option 1 - disallow the window manager to decorate the windows
Graphics->Window Settings->uncheck box "Allow the window manager to decorate the windows"
Option 2 - have Wine emulate a virtual desktop
Graphics->Window Settings->check box "Emulate a virtual desktop"
Both options are configurations to Wine which can be found in "Wine
configuration", which does not need to be started from the command-line;
that is just the method that I've chosen.