Editing options are different for manually-placed spines and spines placed by AutoSpine.
Click Edit>Select Objectsor the icon .
The Thickness Adjustment slider in the Edit Tool window doesn't apply to spines. Use the right-click menu instead.
Remove spine—Deletes the spine marker(s).
Modify Z position of point—Shift or set Z values.
Modify point thickness—Modifies the intrinsic size of a spine.
Change selected spine classes—Modifies the selected spine type.
Remove Selected Spine—Deletes the selected spine marker(s).
Highlight Selected Points Only—Highlights the selected spines.
Undo Last—Undoes the last change to a spine.
Exit Selection Tool—Exits the editing mode.