Given a table whose rows are grouped by a certain column X, how does one sort the grouped rows by the summed column Y?

Hello all, I'm using the new "Group rows by" feature explained here under Table > Content > Advanced > Group Rows By and grouping by a column "Current cpt code." Is there any way I can then click the headers of the other columns (i.e., Estimated Missing Claims or Estimated Missing Dollars) to then order the collapsed/grouped rows? For some reason, when I click these headers, the table no longer sorts in its collapsed/group condition.

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