As mentioned above, you can update the board query or subquery to hide closed issues.
Another option is to use the "Release" button on the top-right of the board, this will create a release and mark all the closed items as released, so they should no longer show. You would need to to this periodically, say once a month, to stop the column from filling up again.
Remember that time you realized it was possible to refresh your Jira data in Google sheets with just one click? What if we told you that you can now get the latest data with no clicks at all?! Zero! ...
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