How to edit shapes in PowerPoint

Click the shape that you want to change.

To select multiple shapes, press and hold CTRL while you click the shapes.
Under Drawing Tools, on the Format tab, in the Insert Shapes group, click Edit Shape .

If you do not see the Drawing Tools or Format tabs, make sure that you selected a shape.
In this gallery, select the Edit Points option
Drag one of the vertexes that outline the shape. A vertex is the point, indicated by a black dot, where a curve ends or the point where two line segments meet in a freeform shape.

Working with editing points

To add a point, click the shape outline while pressing Ctrl.
To delete a point, click the point while pressing Ctrl.
To have the point treated as a smooth point, press Shift while dragging either of the handles attached to the point. Once you stop dragging, the point will be changed to a smooth point. A smooth point joins two line segments of equal length.
To have the point treated as a straight point, press Ctrl while dragging either of the handles attached to the point. Once you stop dragging the point will be changed to a straight point. A straight point joins two line segments of different lengths.
To have the point treated as a corner point, press Alt while dragging either of the handles attached to the point. Once you stop dragging the point will be changed to a corner point. A corner point joins two line segments with one segment going off in a different direction.
To cancel the change to the point and line segments, press Esc before releasing the mouse button.
To open Edit Points mode with keyboard shortcuts, select the shape and then press Alt + JD, E, E.

Simple Graphic