
Today, corner radius is controlled via clicking and dragging the "control points"found around the shape. In the first image shown below you can see a set of five control points (yellow diamonds) attached to the shape. The four points attached directly to the shape control corner radius and the fifth controls the overall size of the shape.

To adjust the radius of all four corners at the same time, click and drag any one of the four control points found on the path of the rectangle, or...

...adjust each corner independently by holding down the "Alt" button on your keyboard (PC) or the "Options" button on the MAC while clicking and dragging the corner you'd like to adjust.

To resize your shape simply click and drag the control point that sits just outside the border of the shape.
