Dashboards are not linked to a project and can contain data from different sources, depending on your permissions and the type of gadgets on the dashboard.
I assume you mean Boards? There the answer is simple, you can't do that in team-managed. However there is a feature request:
Make every click count—help us plant 50,000 trees! 🌳
Want to make your everyday Community actions directly contribute to reforestation? The Atlassian Community can achieve this goal by liking a post, attending an ACE, sending your peers kudos, and so much more!
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