[Pyros]

Sorry for asking but at which point you select whether the Player #1 is controlled by AI or by Human?

Perhaps you are referring to the option during loading a campaign savegame (to change the control of Player #1 from human to AI).

In such a case if you wish to set the control of Player #1 to AI, you may do it from the Headquarter menu during your normal turn.

Simply click the HQ menu and then change the control of all units from human to AI.

cheers,
Pyros