Answer:
First, check to see if the "design of deformation" has been activated in the settings for the calculation of the SLS design checks.
Furthermore, check whether a load for the "quasi-permanent" design situation has been specified in the "Serviceability" tab of Window 1.1. By default, the calculation of deformations in RF‑CONCRETE Surfaces (with RF‑CONCRETE Deflect or RF‑CONCRETE NL) requires a quasi-permanent load.
