Power Up Your Related Lists with Enhanced Related Lists (Beta)
How: From the related lists component in the Lightning App Builder, select Enhanced List from the Related List Type dropdown (1). You can customize how many records to display at once, and choose whether to show the list view action bar.
Choosing Enhanced List affects all related lists in the component (2). To customize which columns appear in a particular related list, edit the related list in the page layout editor and add more fields.