Hi Kidist,
In previous versions the three spheres were displayed, but it was making the figure difficult to read. It was not very informative because it was difficult to see where the two inner spheres were.
You can edit the function brainstorm3/toolbox/gui/view_spheres.m: at line 161, change “Radii(end)” to “Radii(1)” or “Radii(2)” to see the two other spheres.
Cheers,
Francois