Available in: Salesforce Classic and Lightning Experience
Available in: All editions except Database.com
Changes you make to a compact layout are reflected in both Salesforce1 and Lightning Experience.
Each record type can have only one compact layout assigned to it. However, a compact layout can be associated with multiple record types.
Users who don’t have access to certain fields in Salesforce won’t see them on the compact layout.
A compact layout must contain at least one field.
A compact layout can only contain fields from its object, including a formula field that is a cross-object reference to another object.
Removing a field from a page layout doesn’t remove it from the object’s compact layout. The two layout types are independent.
If you change a field on a compact layout to an unsupported type, the field is removed from the compact layout.
Before you can delete a compact layout that’s set as the primary compact layout for the object, you must choose another compact layout to replace it.
In Salesforce1, tasks automatically show whether a task is open or closed and the due date (depending on a user’s access to activity dates). When customizing a task compact layout, you don’t need to add these fields to the Selected Fields list.
Compact layouts aren’t available for the Chatter Mobile for BlackBerry or Dashboards for iPad mobile apps.