Summation Report with Details cannot be grouped by the “Full Name” of the assigned to user

Hello,

When creating a grouped report for opportunities, it cannot be grouped by the “Full Name” of the assigned to.





The field is not available. However, the field can be selected under “Choose Display Summaries.”




This is unfortunate, as it means that only the username is displayed in the charts, not the full name.





Is there a workaround for this?


Thanks!
Steffen