You can convert the points on a path between corner to smooth points. Using options in the Control panel, you can quickly convert multiple anchor points. Using the Convert Anchor Point tool, you can choose to convert only one side of the point, and you can precisely alter the curve as you convert the point.
To use the anchor point conversion options in the Control panel, only relevant anchor points, not the entire object, should be selected. If you select multiple objects, one of the objects must be only partially selected. When entire objects are selected, the Control panel options change to those that affect the entire object.
To convert a corner point to a smooth point, drag a direction point out of the corner point.
To convert a smooth point to a corner point without direction lines, click the smooth point.
To convert a smooth point to a corner point with independent direction lines, drag either direction point.
To convert a corner point without direction lines to a corner point with independent direction lines, first drag a direction point out of a corner point (making it a smooth point with direction lines). Release the mouse button only (don’t release any keys you may have pressed to activate the Convert Anchor Point tool), and then drag either direction point.