If you want to keep your dashboard list from becoming too cluttered, you can delete a dashboard if it is no longer required. This can be accomplished in one of two ways:
Via the Account Settings
page - this method Requires Admin permissions.
Via the Dashboard Options
menu - this method requires you to own the dashboard or have Edit
permissions.
Account Settings
pageClick Account Settings > Dashboards.
In the list of dashboards, click the dashboard you want to delete.
Click Delete Dashboard.
Example:
Dashboard Options
menuClick the Dashboard Options menu at the top of the screen.
In the dropdown, click Delete.
When prompted to confirm, click Delete.
Example: