You can modify shape (rectangle or circle) attributes by using the Shape attributes panel.
Reposition a shape on the canvas simply by dragging it to a new position.
You can also resize a shape by clicking on the shape, and then dragging the handles that appear across the canvas.
A shape can be rotated by dragging the rotation handle across the canvas. The rotation handle is positioned above the shape.
The shape attributes appears when you select a shape. In the Shape attributes panel, you can change other properties of the shape, including:
Delete a shape by either: