You can move, scale, or rotate a selected composite objects using grips or gizmos.

Modify Original Components of Composites

When the History property is set to Record (On), press the Ctrl key to display any
original forms that were removed during a union, subtract, or intersect operation.
If the original, removed form was a solid primitive, you can drag the displayed grips
to change its shape and size. As a result, the composite object is modified.

If the selected individual form does not contain its history, you can move, rotate,
scale, or delete the form.

Modify Complex Composites

A composite object might be made up of other composite objects. You can select the
history images of composite objects by holding down the Ctrl key as you click the
forms. (For best results, set the subobject selection filter to Solid History.)

You can also change the size and shape of composite objects by clicking and dragging
grips on individual faces, edges, and vertices.

Separate Discrete Objects Combined With a Union

If you have combined discrete 3D solids or surfaces using a union operation, you
can separate them into their original components. (Use the Separate option of the
SOLIDEDIT command.) Composite objects cannot overlap or share a common area or volume
to be separated.

After separation, the individual solids retain their original layers and colors. All
nested 3D solid objects are restored to their simplest forms.