Power BI leads the user to believe it is possible to export summarized data at the level of the current view. In fact, the result of [Matrix grid] > Ellipsis > Export data is that data is exported at the lowest level of the drill-down path. In one case, I am viewing 4 rows of data in my matrix grid (drilled up to the top level of the data hierarchy). When I export to xlsx, i get over 15,000 rows of data (summarized at the lowest level of my data hierarchy). Users should be able to export data at the level they are currently drilled down to on their report.