This being an obvious approach to how Dashboards are by default seen by all. And how you can disable/hide for users. Even for D365 System Administrators!
Unlike usual forms, view or other records,
And Deleting the Dashboard isn’t an option.
So a simple trick is to remove entire access from Enable Security Roles
Make sure Display only to these selected security roles
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D365 Quick Tip: Hide Dashboards in D365
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