Answer:
Manual alignment of the FE mesh is possible in RFEM using "auxiliary points".
When generating the mesh, each entered point acts as a restraint point for the FE mesh, which allows you to design it individually. To do this, activate the "Integrate Unutilized Objects into Surfaces" option.
When entering the length of the FE elements, make sure that the global mesh is not smaller than the distances between the points.
The "normal" points are used as auxiliary points for this.