Hello bodgan,
You have made mistake at two places. Once in the title and repeated the same in the narration.
You are not talking about CS23 but you are talking about CA23 .
Coming to your query, it is setting of a standard program and not possible to expand this table. To expand the table, we need to make modifications in the layout of this screen through SE51 for which ABAPer will need access key of the standard program. So I do not think there can be any justification to go for it.
Regards
KJogeswaraRao