- From the Primer Design view, click on the Selection Mode tool ( ) at the top left of the window.
- 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.
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