on my iMac Pro I cannot get the networking system to prefer ethernet over wifi. How can we fix this?

I have seen this question posted and answered before, but it does not really answer the question truly. Yes, you can go into network > click on the circle with 3 dots in the bottom of the list and then select "set service order".... which then lets you re-arrange service order priority.

All seems direct and forward, right? Well, here's the problem.

No matter what order I put the networks into, it still prefers the wi-fi over the ethernet.

Kind of frustrating?!

is there any way to fix this?