There are two ways to do it
1)Start the VM Fusion. Click on the icon in your "menu bar' and from the menu select the option at the bottom called "Applications Menu Setting".
This will open a new window where you can choose to disable this icon(from "Show applications menu in menu bar:").
The other way is following:
2.)You can also open the vm settings of one of your vm's and go to Applications (this is the window that will open when selecting the aforementioned option in the menubar icon).