I woudl need still to see Issues completed more than 14 days ago are hidden, keeping your board fresh and up to date. please can you advise how can i change it / configure
There are different types of projects, see the documentation https://support.atlassian.com/jira-core-cloud/docs/what-is-the-jira-family-of-applications/. If you are using Business projects type, there is no possiblity to edit board.
The bes way is to create a new project of different type (standard software for example) and move all issues into it.
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