Summary Fields not available for changes..

Summary Fields not available for changes..

If a record summary field is not included in the viewable summary we are unable to make changes after initially created. For example, if I do not include Editor Group. How can I go back and make changes if they chose the wrong group when creating the record? 

I was given the workaround of using the mass changes in the records grid but would like to have the ability to make changes at the record level for ALL summary fields whether included in the summary page or not.