How can I change the Dropbox Account on MacBook Air?

Hi Team - I recently updated to a new MacBook and copied my existing profile across from my old MacBook in order to simplify things. The old MacBook contained several Apple accounts, each with its own (unlinked) Dropbox account. Although I only installed one Apple account on the new MacBook, the wrong Dropbox account (and its files!!) has appeared under that Apple account. Lucky it's only my partner's account and files! I've tried to uninstall, remove, then reinstall Dropbox from the new MacBook a number of times, however each time I reinstall Dropbox, it wants to open the wrong account. How can I permanently disassociate that Dropbox account from my MacBook, so I can then start again and link it to the right Dropbox account? Thanks heaps!