Hybrid Azure AD Join option missing from Azure AD Connect

Please note that the instructions you're referring to are written for an environment already using AADConnect (as mentioned in https://docs.microsoft.com/en-us/azure/active-directory/devices/howto-hybrid-azure-ad-join#prerequisites). You may want to https://docs.microsoft.com/en-us/azure/active-directory/hybrid/how-to-connect-install-roadmap.

The menu item "Configure device options" is part of https://docs.microsoft.com/en-us/azure/active-directory/hybrid/how-to-connect-post-installation. 

Hope this helps!