How can I do to show menus in LibreOffice Writer (4.2.2) for Linux (Zorin OS 8 Ultimate)

Good afternoon! I have installed Zorin OS 8 Ultimate on Sunday and then I upgraded my Libreoffice version to the latest one, but I noticed that the menus are gone. What should I do in this case? My work implies converting odt files to the PDF/A format and making other formatting settings to the files. Please help me? Thanks in advance! Have a nice day!

Are you running LO installed from PPA or from the website? I am not sure the website version includes Unity integration.