There is no ON/OFF switch. You have to configure the Dive Bomb Button and to use it, press the button you selected and WHILE PRESSED, click the LEFT mouse button.
With that, your planes will go to the selected place and Dive... when they have a target place selected, you can press the drop button and they will drop the bombs in any place between where they are and where they should dive. To make it simple... once you select a dive location, the drop button is enabled.
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