When reshaping an entire closed path, delimiters are not necessarily helpful, because, in a sense, the path does not have a beginning and an end. In this case you may use Looped mode. In this mode, which is only applicable for closed paths, there are no delimiters. Instead, there is a special blue marker pair which is located at “point zero” along the path and cannot be moved or deleted. If point zero is smooth, the pair will appear as a single marker; if point zero is a corner point, the markers will appear separately. In either case, the pair's common length may be adjusted by dragging either of the blue markers to set the offset of the path at that point. Additional normal markers may be set at other positions along the path.
Reform Looped Mode
To enter looped mode on a closed path which is already being reshaped, doubleclick
either one of the delimiters. To enter looped mode immediately when starting a new reshape, hold down Option/Alt
when initially clicking or dragging the path.
Since the entire path is affected in looped mode, the Transition parameter is no longer applicable.