How to show gnome-terminal menubar?

Right click anywhere inside the terminal, and you'll get a similar pop up menu that lets you reenable it.

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If you're running an application like vi you won't get this menu. In that case exit or suspend the application first, then it should work. (I.e. ^Z (control-Z) to suspend, then right click to get this menu, and select Show MenuBar, then finally enter % and ↵ Enter to resume.)

You can also make it via terminal command line:

gnome-terminal  --show-menubar

If you read the man gnome-terminal you can find this:

  --show-menubar
                 Turn  on  the menu bar for the last-specified window; applies
                 to only one window; can be specified once for each window you
                 create from the command line.