I have noticed a difference between a Read Only Opportunity Grid, and an Editable Opportunity Grid when filters or sorting is applied to columns within the Grid. When it comes to a Read Only Grid, if you manually Expand a Column then apply a filter/sort, the column will remain expanded after the filter/sort is applied. However, when it comes to an Editable Grid, if you manually Expand a Column then apply a filter/sort, the column will Collapse after the filter/sort is applied. Would it be possible to have the Columns within an Editable Grid remain Expanded after a filter/sort is applied as within the Read Only Grid?