When using Draw tools and depending on the geometry you are drawing, one or more edit handles let you make on-the-fly changes. Drag a handle with one finger to a new location. You can, for example:
- Drag the edit handle at the center of a circle or sphere to a new location,
- Drag the edit handle at the corner of a rectangle to resize it,
- Or, drag the edit handle at the endpoint of a line to a new location.