As long as you are a board admin, you can move that board off of your team by opening the board's menu, clicking on "More", then "Settings", and then "Change Team." From there, you can select the team you'd like your board to belong to from the drop down menu.
We have some more information on how to do that here: Changing the team to which a board belongs
If you had to thrive a new habit during a lockdown, what would it be? Trello
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event