Need to stop VNC Server on shutdown and NOT automatically restart in Raspbian

Need to stop VNC Server on shutdown and NOT automatically restart in Raspbian.

All I can find is how to have VNC server start automatically on boot.  I do not want this.

Using a Raspberry Pi 3B with OS version 9, stretch.

Raspberry Pi 3B can use only one monitor at a time and I need to boot to the connected monitor.

Then I can run script to start VNC.

Me being me I will forget to manually run a script to turn off VNC before shutdown, so I need a way to automatically disconnect VNC on shutdown so on reboot connected monitor starts, NOT VNC.

So I can use VNC when I want and not worry about remembering to turn it off every time I shut down?

How do I do this? 

Thanks!