Not able to create mirrored column without linking board a second time

I have two boards that I linked a year ago and created mirrored columns at that time. I now want to add one more mirrored column and Monday.com prompts me to create a new link to the same board (and thus add another linking column). How do I simply add one more mirrored column linked to the same board?

Just go to the settings of the existing connect board column…

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Thank you so much!! Super helpful!