I'm taking an online Blender course and the instructor is using the "To Sphere" option to make the holes for a bowling ball made from an icosphere. So for the picture here I insetted the edges, subdivided by 3, then tried "To Sphere" but nothing happened. Does anyone know how to fix this?
The 'To Sphere' tool on selected vertices is tricky to use because you have to move the mouse and not every direction results in a change.
When you use the tool, moving the mouse left enough will diminish the effect, moving the mouse right enough, it will turn into a sphere.
In most cases, you'll probably want the full force, a clean circle. Then numeric input is your friend. Just use the tool and don't bother using the mouse. Hit 1RETURN. That is a safe way to use the tool.