Oh, you're right, when changing the size of the preview window, the whole sphere effect changes, and adapt (eventually looking like intended at certain sizes).
I noticed even when zooming and moving around in the layout view, the sphere effect reacts strangely in real time. Is there any way to "lock" this effect ??
As you can see, the sphere effect "follows" the scrolling down of the layout scroll bar. Is there a way to apply this effect without it moving around like that ?