1. Set up quick actions for your objects.
2. From Setup, click the Object Manager tab.
3. Select the object you want to allow mass quick actions on, and customize the object's list view layout under the Search Layouts setup page.In this example, we selected the case object.
4. Edit the List View layout.
5. In the List View Actions in Lightning Experience section, add the actions you want your users to be able to perform on list views for multiple records.