At this moment the Portal SharePoint integration grid is hardcoded to show just "filename" and "modified date" columns.
It is not supported in any other column since the information we see in these 2 columns is not coming from the document location entity view but from the SharePoint document library.
It is also not supported sorting columns in the view today.

Recently there are many needs to customize Portal SharePoint integration grid columns.
Hence it would be greatly appreciated to add this feature.
It would also increase the customer's productivity.