Final answer:
In Adobe InDesign, the Convert Direction Point Tool is used to toggle between corner points and smooth points, giving users control over the curvature of paths and shapes within their designs.
Step-by-step explanation:
The tool in Adobe InDesign that allows users to change corner points into smooth points, and vice versa, is known as the Convert Direction Point Tool. It's part of the Pen toolset and can be accessed by either clicking and holding the Pen tool in the toolbar to reveal additional tools, or using the shortcut key which may vary depending on your system. By selecting a point with the Convert Direction Point Tool, users can alter between sharp angles and curved lines, providing versatility in creating custom shapes and path adjustments.