Designs can be manipulated using the icons in the corners of the bounding box. These icons are as follows:

Delete (top left) – Tap to delete the selected shape(s).

Rotate (top right) – Tap and drag to rotate the selected shape(s) to the desired angle.

Scale (bottom right) – Tap and drag to increase/decrease the size of the selected shape(s).
Duplicate (bottom left) – Tap to duplicate the selected shape(s).