Molecule and surface display style can be changed on a per-molecule, per-surface basis, it is possible to change atom and bond display style, color and size. It is also possible to change the display style for residues and show/hide the dipole moment.
All the per-molecule display settings can be changed through the Molecule Display Settings dialog (Display->Molecule).

The overall molecule representation can be changed through the Molecule drop down listbox; available styles are:
Atom representation can be changed through the Atom drop-down listbox; some of the available representations are:
Bond representation can be changed through the Bond drop-down listbox; some of the available representations are:
Residue representation can be changed through the Residue drop-down listbox; available styles are:
Atom and bond detail can be changed with the Detail sliders.
Size of atoms and bonds can be changed with the Scaling sliders. The minimum value for atom and bond radius is zero; the maximum value of atom radius is the length of the covalent radius.
The color of atom and bonds rendered with SoSphere and SoCylinder style can be selected by pressing the Color button. When a SoXXX style is selected all the atom and/or bonds are rendered with the same color.
Atom colors can changed by reading the per-atom color values from a text file, a sample file is included in the data directory.
When the Real-time update checkbox is checked changes are applied immediately and the 3d view refreshed each time a value is changed.