Need sort options for detail tables (generated from clicking on reports)

I'm referring to when you set a report to "click to expand group records" and you can click on parts of the report (such as a bar in a bar chart), to get a little table to pop up that lists the values in that section of the report.

For that table that's created, I don't see any way of choosing how it sorts. Typically in a table it has the "Data Source" tab where you choose what records it filters and you can set the default sorting options from there, but that tab is removed in these kinds of detail tables. I understand removing the filter functionality but it also removes the sort option.

I know users can still click to sort columns but setting the sort by default is helpful to put certain important information at the top and immediately apparent especially if the table is displaying hundreds of records.