I'm hoping the multi-monitor experts here have an idea.

This week I upgraded my system from two to three monitors (going to four when my replacement desk arrives and I can mount the arms).

My left-to-right arrangement is, using display number, 3-2-1 (where 1 is plugged into primary card, port 2 and 2 is plugged into primary card port 1, and 3 is plugged into secondary card). I've tried swapping the ports on the primary card with no impact on the display numbers.

Lightroom (stupidly) does a next-in-list-with-wrapping selection for the secondary monitor.

With two monitors, if the main window is on 1, secondary is on 2. If main is on 2, secondary is on 1.
With three monitors, the pairs are (main/secondary): 1/2, 2/3, 3/1.

But, what I want is 2/1.

Until Lightroom fixes their stupidity to let the user customize the monitor to use for the secondary, I'm stuck, unless I can re-number my monitors so they're 3-1-2 (swapping 1 and 2).

Perhaps it might help if I understood why 1 is 1 and 2 is 2, regardless of which port on the primary card each is plugged into. If there was a hardware solution to swapping the numbers, that would work. Or maybe there's a registry entry.

Any ideas? Googling hasn't found me anything usable.

Thanks.