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The Change Board button takes the user to the second page of the modal where the currently selected Board Template can be switched out. The user can use filters to narrow down the selection and after finding an appropriate Board Template it only needs to be selected to be active for the next Retrospective Board. Clicking the Back button will take the User back to the Board creation page of the modal with the actually selected board being displayed.
Always the last used template will be the default for the next time.
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