No more tedious one-by-one selections – now you can handle your dashboards in batches for improved efficiency with bulk selections. For example, you can now simultaneously change ownership for multiple dashboards to align with organizational changes, and maintain data accuracy and security.
Where: This change applies to Lightning Experience in Group, Essentials, Professional, Enterprise, Performance, Unlimited, and Developer editions. Access to CRM Analytics assets is available for an extra cost.
How: From the App Launcher, find and select Analytics, then browse or search for your dashboards on the Analytics tab. Click the checkbox next to the items you want to manage. To change ownership, click Manage Items.
Streamline Management of Your Dashboards With Bulk Selection (salesforce.com)