2 Spheres - modify lines after boolean operation

 From:  Lara (MALA)
5796.1 
Hi,
I made a boolean substraction of two spheres. Then I rounded it with "fillet".
Now I intend to modify the shape of the object through finetuning of the splines. But I cannot scale for example the splines.
Isn“t it possible?

Best regards
Mark


EDITED: 10 Feb 2021 by MALA