To modify the primer length:

  1. Create or import primers or primer pairs.
  1. From the Primer Design view, click on the Selection Mode tool ( ) at the top left of the window.
  1. Do any of the following:
    • Use the mouse to drag one or both handles at the ends of each primer in either direction.



    • Select a base at either end of the primer and press the Delete key.

    • Select a base at either end of the primer and press the Ctrl/Cmd key while pressing the left or right arrow keys on the keyboard.