The solution is in Mac OS, the Keyboard Shortcut "Function Keys" can be assigned to any app and will permanently display the Escape Key and F1 through F12 in the Touch bar.
The option "Customize Toolbar ..." option in the Menu of VMWare Fusion will be grayed out if you have selected this shortcut for VMWare Fusion.app.
To set this:
Open System Preferences.app, select Keyboard and then the Shortcuts tab. From the shortcuts list on the left select "Function Keys" which will be highlighted. Then press the "+" button below the app list to add a new app. In the browse popup select VMWare Fusion.app.