The menu shown when you tap a group name has been simplified, to show only the various send options.
All the less commonly-used functions such as “Rename” “Duplicate” and “Print” can now be accessed by tapping the “More…” button.
This is also where you will find the new “Save as .CSV” feature, added as a result of customer requests. This which will export your group as a .CSV file. The file can be found in the “Mailshot” folder in the “On My iPhone” (or “On My iPad”) section of the Files app, and can be loaded into Numbers or other popular spreadsheet apps.