Corner Radius
The Corner radius property determines how round the corners of a layer is. The rectangle shape is currently the only layer type with an editable corner radius property.
From the canvas:
Select your rectangle shape layer.
Whilst hovering on the shape, you'll see corner radius indicators shaped like dots, close to the inner area of its four corners.
Drag any of these to make the corners more or less round as preferred.

From the property panel
Select your rectangle shape layer and go to the property panel.
In the corner radius field, you can specify a value for how round the corner should be.

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