Batting: How-To : Set the Strike Zone Size

To set the size of the strike zone from the Batting Practice screen, click on Options.

Click on Set Strike Zone Size.

You can make the strike zone wider by clicking on the + button next to the Width and make is narrower by clicking the - button. Similarly, you can make the strike zone vertically larger by clicking on the + button next to the Height and make is vertically shorter by clicking the - button.