I have added a grouping in a report but it is not working how i had expected. I wanted to group a summary on a field named Size but when i add the grouping the report is still showing me each record and making a summary at the bottom of the report.

What i would like is to just see the total for each different value that is in the size field added together (sum)

attached is what my report is giving me, any help woild be appriectated as i have tried to get this right now for many hours!