Click the Edit Contents button in
the Control panel.
Choose Object > Envelope Distort >
Edit Contents.
Note: If your envelope consists of grouped paths,
click the triangle to the left of the <Envelope> entry in
the Layers panel to view and target the path you want to edit.
Edit it as desired.
Note: When you modify the contents of an envelope, the envelope
shifts to recenter the results with the original content.
To return the object to its enveloped state, do one of
the following:
Click the Edit Envelope button in
the Control panel.