Pin Dashboard
To pin a dashboard, click the dashboard selector
and click
from the list of the Dashboards. Select Pin Dashboard. The pinned dashboards will appear even after you log out from your account or refresh the page.

You can not pin more than five dashboards in your account. Thus, the total number of pinned dashboards displayed will be six including the Default Dashboard.
To unpin a dashboard, click
from the pinned dashboard and select Unpin Dashboard

You can also click on the pin of the dashboard to unpin.