Control Point Toolbar
By default, the Control Point toolbar provides tools for modifying, adding, and deleting control points for applicable markups (such as the Polyline, Polygon, Arc, and Cloud markups) or measurements (such as the Area, Perimeter, and Volume measurement markups). These tools will be unavailable/dimmed if the selected markup cannot have its control points modified.
Note: The exact tools a user will see depends on their Profile, licensing, and the customizations they have made and might not include all the tools mentioned here.
The toolbar may be hidden, and you can unhide it by following the steps in the Show / Hide Toolbars article. Below is an image of the toolbar.
Add Control Point: Adds a new point where the mouse is clicked.
Subtract Control Point: When clicked on an existing control point, deletes the point while leaving the shape.
Convert Control Point: Click to toggle between a corner and an arc; click and drag to control the arc more precisely.