I'm relatively new to WGT and I don't see much reference to putt preview. I feel it should only be available in practice mode. When I invite a friend to play heads-up, it shouldn't be there or at least make switchable by the inviter. It's too much aid and the game is more fun and challenging without it IMHO.
If you play with a friend why not just agree not to use it. ?
However as a newbie , you may find it teaches you a lot about putting , and between friends does it matter who wins ?