Where: This change applies to Lightning Experience in Group, Essentials, Professional, Enterprise, Performance, Unlimited, and Developer editions.
Why: We’re giving you more out-of-the-box options so that you can choose a view that fits your users’ business needs and preferences. In addition to the view that currently exists, we’ve added Full view, an alternative view. Full view (1) displays all details and related lists on the same page. Grouped view (2), the original Lightning Experience record view, focuses on specifics by grouping information across tabs and columns.
How: If you’re already using Lightning Experience, you can change your org’s default record view in Setup. If you turn on Lightning Experience after Summer ’19, you configure these settings in the Lightning Experience Transition Assistant before you enable Lightning Experience, or in Setup after enabling Lightning Experience.