...
The Summary Description formula is configured on the Component Types lookup edit screen for program component forms, and on the Form Details screen for all other form types.
...
for Program Component forms, the summary label is displayed in the Summary column of a program components list screen (for example, on the Site Details > Program Components list page)
for all other forms (Applications, Service Requests, Complaints, etc.), the summary label, if configured, is displayed on the following screens; Dashboard, :
Submissions - All,
Submissions - Inbox,
Submission Detail (right sidebar),
Site - Dashboard, and
Site - Submissions List
This page describes how to configure this field.
...