Close a board by selecting "Close Board" from the board menu (open the board's menu and click the "More" button to expand the menu options). You have to be an admin of a board to close it.
Premium Workspace admins are able to close any board within their Workspace, even if they are not an admin of that particular board or if it is a 'private' board within the Workspace.
Other board members will receive a notification that the board has been closed.
Close a board from the board's menu.
Finding a closed board
Closed boards are no longer visible in your Boards list and can only be accessed by clicking the ‘View closed boards’ button at the bottom of your Boards page.
Just like closing a board, you must be an admin to reopen a board.
Leaving a closed board
If you're trying to leave a board after it's been closed, you can use the Leave Closed Board tool: https://trello.com/support/leave-closed-board
Closing a board on the mobile app
If you're using the Trello app for iOS or Android, you can close a board by first opening that board and then opening it's menu (the "..." icon in the top right of the page). From there, select the gear icon in the iOS app or the "Board Settings" option on Android. Select "Archive Board" from the options in the settings to close the board.
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