You can add a hidden dashboard to My Dashboards on the Navigation menu using the Dashboard Search dialog box.
To add a hidden dashboard to My Dashboard on the Navigation menu, complete the following steps:
Select the dashboard from the Dashboard Search dialog box, or select the dashboard from Public Dashboards on the Navigation menu, if it is a shared dashboard.
After displaying the dashboard, click Add to Menu on the Dashboard toolbar.
Learn about the Dashboard toolbar
Configure access control to dashboards