Answer:
In the main program RFEM 5 or RSTAB 8, it is necessary first to rotate the member about 90° to ensure the lamellas of the glued-laminated beam are lying edgewise (see Image 01).
In order to also consider the on-edge position of the beam for the design using the RF‑/TIMBER Pro add-on module, increase the resistance for edgewise bending in the National Annex parameters in the "Other Settings 2/2" tab (see Image 02).