The field "Portfolio information" is a formatter field in the Portfolio form. However, it is not showing up no matter how you browse through the existing record
Portfolio information (Formatter) uses UI macro "portfolio_info" which is just present for backup purpose from Fuji onwards
Since this formatter is not in use, customer can delete the "Portfolio information (formatter)" from the form design if they don't need that
Before Eureka we have different data model for project to portfolio and it got changed from fuji. In those releases this macro was in use, now we are maintaining just for backup.