Curves are drawn according to the free movement of the mouse.
Tools panel "free hand" button.
Move the cursor over the document window.
CursorChanges to a.
Press the mouse button will draw the line as you move the mouse while the mouse movement.
Hold down the alt key to start drawing, closed shape is created at the end of the New.
When you release the mouse button ends the freehand drawing.
When a large line width miter connection, they may have been cut in the middle of the line connecting the edge of the drawing area.
At the edge of the drawing area so please make a small angle-line.