Smoothing a freehand line
The slider on the Freehand & Brush Tool Infobar controls how accurately the final line follows your original mouse movements. At 0%, the final line closely follows your original movements. This creates a line with many point handles. Higher percentages insert fewer point handles and produce a less accurate but smoother line.
Tips
 You can smooth a freehand line at 
 any time until you draw another freehand line. The Infobar shows Refit when smoothing is possible.
 You can smooth a freehand line at 
 any time until you draw another freehand line. The Infobar shows Refit when smoothing is possible. 
 You can always smooth a line or 
 shape using the Smoothing Slider 
 on the Shape Editor Tool Infobar, 
 see Smoothing lines and shapes.
 You can always smooth a line or 
 shape using the Smoothing Slider 
 on the Shape Editor Tool Infobar, 
 see Smoothing lines and shapes.