Unlink Mirror columns

Using Mirror Columns, I can see that the boards where the column is linked can be tracked, but I would like for there to be a way to delete/unlink those boards from the column.

For example, I currently have a Mirrored Column to 3 other Boards, but I don’t need them to be linked anymore, so I want there to be a way for me to remove that link and keep the board/column as-is rather than having to delete the other columns from the other boards.