With no modification in V7 IcCube reporting, a Pivot table with multiple header rows had labels centered automatically. In V8, I cannot find how to reproduce this.
Here is what we have in V7 : 1st row header labels are centered accross their 3 columns total length.

How can we center this again by default in V8 ?

This is a current limitation: only the last row of the top header is respecting the
Header Alignmentconfiguration. This will be changed in the upcoming version (v8.3): this configuration will apply to all the rows.