I have created a PowerBI report using Matrix Preview. I have added two hierarchies, one on row shelf and another one on column shelf. I am able to expand through the row shelf hierarchy, but for column shelf seems like i can only drill down. I do have the option to Expand and Drill down a column hierarchy if i access power BI through a browser, but same is not avaiavle in iPad Application. No menu is displayed on long select of the column value.