Tools->Options->Environment Options->Form Designer->, uncheck Auto create forms & data modules. You'll still get the unit added to the uses clause at the top, but it won't generate the Application. CreateForm code.

위는 최신 델파이 설정 방법이 아닌거 같다.

현재 10.4 이상 기준

Tools > Options > User Interface > Form Designer > "Auto create forms & data modules" 체크 해제