Answer:
In RF-/CONCRETE Members, the depth of the concrete compression zone can be viewed in the intermediate results of Window "4.1 Serviceability Limit State", see Image 01.
The output takes place within the printout report when activated accordingly.
In RF-CONCRETE Surfaces, the depth of the concrete compression zone is only determined if the cross-section is cracked. It can be viewed in Window "3.1 Serviceability Limit State" in the design details of a point, see Image 02.
You can use the Excel button to export the design details.