You may have unwillingly changed the GUI mode for a rather experimental one mimicking M$ Ribbon.
See if you have in rightmost position of second toolbar a menu with name Menu
or View
. Both Menu
and View
have a check box for Menubar.
In the tabbed modes, click on the View
tab and this will bring a Menubar
button in the lower toolbar.
Once you have recovered the menu, revert to the usual GUI with View
>User Interface
>Standard Toolbar
.
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