This can occur if trying to display racer images. You can do one of two things, hide the racer image column or change the size of displayed images.

To hide the racer image column, go to the View menu of the Racing screen. The Image Column option will be checked if that column is being displayed. Select that menu option and it will then hide that column.

To change the displayed size of the images (not the size of the images themselves), go to the General tab of the Software Settings screen. Adjust the Maximum Height of the racer images until you are able to see all lanes on the racing screen.