When invoked without any arguments, the cofr command reports the current center of rotation.
If an atom-spec is given, the center of rotation is set to the the center of the bounding box of the specified atoms (only those which are displayed; some may be invisible) and the center of rotation method is set to fixed.
If the view keyword is given instead, the center of rotation is set to track the center of the view (the center of rotation method is set to center of view).
~Cofr restores the default center of rotation method, center of models: the center of rotation is the center of the bounding box of the currently active models (displayed portions only; may include items that are invisible)