To customize any built-in shape in photoshop do the following
Drag the cursor over all the shape(Add Anchor Point tool should still activated) to see where are the anchor point exist, then drag the cursor on any single anchor point to edit it.An alternative way to select the anchor point is to directly click the anchor point.
Here is the shape after editing
This is very helpful if you are making the Abstract art or some Logo designs in Photoshop
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