Controls how the software draws a restraint helix.
By default, a restraint with a variable retention is drawn with a small spring to indicate that it is not fixed. If this property is set to True (the default setting), the software draws the spring as a line; otherwise, the software draws the spring as a coiled cylinder.
If drawing the restraint helix as a line degrades plot performance, set Restraint Helix is a Line to False.