Assign a New Owner to Multiple Leads, Cases, or Custom Objects at One Time
Where: This feature is available in Lightning communities accessed through Lightning Experience and Salesforce Classic, and is available in Enterprise, Performance, Unlimited, and Developer editions.
How: Select up to 200 records and click Change Owner in the page-level action menu, or (depending on your page layout) click in the page-level action menu and then click Change Owner.
In the Change Owner dialog box, enter the new owner name, select Send Email Notification if needed, and click Submit. You must have Edit permission for a selected record to change its owner.