Pivot Table Sorting?

When I simply have Number Of Rows as a value option for my Pivot Table, a carat is introduced if I click on the column. This makes me think that this is sortable? However clicking on the carat does nothing. Also there are no other carats triggerable on the other columns so maybe we aren’t supposed to be able to sort here?

Tell me if I can sort here:

Kei helped me figure this out. You have to get into the gear icon and change sort within group. Instructions are here if anyone else runs into this: