I’m guessing you have a “floor” underneath the sphere. Lose the “floor” = lose the shadow.
If you are using the “floor” for the background color (dark blue) just move it far away from the sphere (GZ-10 ??) so that any shadows cast end up outside the camera shot.
Post moved to a better topic place.
Thanx for advice. I’ve moved “floor” little lower and made small change of light position. Right now I can focus on finishing inside of shpere.