well!! Sorry, what can be the reason of shared topology failure? I mean I form a new part between two bodies, but once I set the mesh the nodes are not coincident..why does it happen?

Another question about share topology is if there is a way to modify the growth rate of mesh elements since at the interface between two bodies belonging to a part the elements of the two bodies have the same size of the body with smaller element size and this is good, but if I want to reduce the elements count I need to set a proper growth rate in order to have elements of smaller size at the interface and greater size by going far from the interface, should I define it from the mesh settings? If I use adaptive mesh the growth rate is not available.