On Thu, 27 Jul 2017 00:05:36 -0000 (UTC),
Mad Roger wrote:

Just for the record, here are the startup calls Opera makes to the search
engines, even with everything possible in the settings turned off.

It's only one step if the network disconnect/reconnect isn't needed:
1. opera://settings/clearBrowserData

I still need to test further but the solution below seems to work but it's
a bit onerous to disconnect/reconnect the network, so I don't recommend it
until I can provide a better one-click method.

1. Disable the network
2. Open Opera to a start page of "opera://settings/clearBrowserData"
(Clear everything Marek found to wipe out the unique vpn & user id)
3. Reconnect the network

That's what I have been doing but I need to practice wireshark more to
figure out if I must disable/enable the network or if it works without that
step to wipe out the old unique user and vpn ids.