How can I lock my Dock location in a multi-display setup?

I have an M4 iMac 24 running the latest Sequoia.

My screen set up is

On Left: the iMac

In Center: Apple Studio Display

On Right: Dell monitor.

This all works fine except I cannot seem to find a way to fix the dock so that it always stays on the left side of the Apple Studio display.

I have experimenting with all sorts of combinations in the Displays systems settings, but can't seem to sort this out.

Any suggestions?

Thanks.

[Re-Titled by Moderator]