You can select the nearest-neighbours for a particular atom in CrystalMaker, and this can be repeated to get the second, third, fourth... neighbours. This is useful if you wish to re-colour your structure, showing different colours for atoms in progressively-more-distance coordination shells.
The following steps assume that you have a correctly-bonded structure, in which the atom of interest is bonded to one or more neighbours.
To select nearest neighbours around a selected atom:
Select the atom whose neighbours you wish to show.
Right-click in the Graphics pane to display a contextual menu, then choose: Extend Selection > Nearest Neighbours (command-E for short).
The first-nearest neighbours are now selected.
Repeat the command to select the second, third, fourth... nearest neighbours.