To change the appearance of IK or FK effectors:
In the Character Controls window select all the IK or FK effectors by clicking 
> Add to Selection > IK or FK.
In the Resources window > Properties tab > Marker Settings > Look drop-down list, select one of the following shapes: 
IK effector marker types A. Circle B. Sphere C. Hard Cross D. Square E. Cube F. Light Cross
Sphere is the default marker type.
The Hard Cross and Light Cross types display the markers as thick and wireframe crosses, respectively.
Selecting None hides all the effectors in a Character in the Viewer window.