Currently in Optimized Grid, Exapndable row editing is not available. Most likely it will be available in future release. Currently in Optimized grid Row editing operation is available only on Modal window. For that you have to check in Editable in modal checkbox. I have verified this feature in Pega 8.3.1.
Thanks Karma for your response. Our requirement is not to edit the row but to see additional information in expanded pane and also to be able to customize the table to show\ hide or re-order the columns. Can you check if that feature is available in 8.3+? I would really appreciate your response.
In Non optimized grid, Expandable row feature is available - Only on Row Editing - in Master Details option - Where display of details can be in Expandable rows. In Optimized Grid this feature is not available currently.