How to remove my Mac from iPhone call audio routing list?

When I'm making a phone call with my iPhone, under the audio button typically I can toggle between phone and speakerphone. But recently a third option appeared, which claims to route the call to my Mac. I never want to use this option, and I want to be able to just tap to turn the speakerphone off and on. Is there any way to turn off the Mac connection so that it won't appear?

I have disabled Allow Calls on Other Devices on my iPhone and that didn't have any effect.

Note: related Apple Community question.

Try allowing all devices and then disabling Mac specifically in the "Calls on other devices" settings you posted.

Open FaceTime-> Preferences on Mac and uncheck receive calls from iPhone checkbox.

On the extreme, if you don't use continuity feature, (didn't see it in the question), could you turn Handoff off altogether in iPhone and/or Mac? It is in Settings -> General-> Handoff on both devices. Either of the devices could be at fault. So check all combinations.