I am trying to replicate something that someone else did. It looks like it is a matrix. It has a bunch of row groups, no apparent column groups. It has few measures that are summed at these rows groups. (again, i see no colum groups)
Normally, you don't get column headers when there are no column groups, but somehow this person made it so that there are column labels across the top of the matrix, including over the measures. These column labels aren't textboxes strategically placed over the matrix. These labels are part of this matrix.
One thing I am seeing is this. When I click on that upside down black arrow in the Column Groups section and enable Advanced Mode, I see something called (Static) appearing in the Row Group and Column Group section. Is that an indication of anything?