Using Global Search
The Global Search menu allows you to search for and select dashboards to view.
To view a list of your existing dashboards, simply click the dashboard drop-down menu.
To search for a dashboard, type in some search criteria in the search bar after clicking the dashboard drop-down menu. If any dashboards match the criteria, they'll display first in the list.
Check it out:
Finding Dashboards Owned by Other Users
Looking for a dashboard owned by another user? If the dashboard can be viewed by others, you can find it by clicking Find in the Dashboard Options drop-down.