How to smooth sphere created using pro-builder

Hello,

I want to create a high resolution shiny sphere .

First , I use the unity's build in 3d sphere object and attached a specular material on it.
the surface is very find except that the edge of the sphere is a bit rough due to low polycount.
(the left side of the attached image)

I then use the pro-builder to create a high poly sphere and attached the same material to it.
The edge looks much better but the surface reflection is not smoothened compared to that using the
unit's build in sphere mesh.
(the right side of the attached image)

How can I me make the high poly sphere (create using the pro-builder) looks as smooth as the
one using build in sphere mesh ?

Thanks