Couple of ways.
In stage 1, Setup, Advanced= On, then Plan Type = Initial. Then forward to stage 2 and you should be able to plug in plan values for prograde etc.
Or power off both MFD's. save (optional), exit orbiter, then either start current scenario or the save. Then power up MFDs and Transx should not have previous arrival from the moon messing with your desire to plan a trip to Jupiter.