New answers tagged globalmenu
WebUpd8 (the site you linked) has an updated instructions to make it work in Xubuntu 16.04. Some manual configurations are required such as creating a shell script in /etc/profile.d/topmenu-gtk.sh. Note that the functionality of TopMenu in Xubuntu16.04 is very limited compared to Ubuntu 14.04. It only works with GTK2 and 3 apps. Qt4 and Thunderbird support ...
Without seeing a screenshot this is my best guess. May be you have your current settings like the one below in your Settings -> Appearance -> Behavior: This will always show the Menus (like File, Edit, View, etc. Change the settings to something like: So that you can see the window title. You can see the menus on mouse hovering.
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