When you have bub in the laying position, the toddler seat goes on top. So they can't see out front, but they're so young when they're in this position that it doesn't really matter. After a couple of months, you can put bub in the toddler seat which goes at the back, and your toddler goes in the main seat (which is in sitting position). Bub will have a good view from that position.
The toddler seat has a max weight limit of 15kg.
You mentioned that you can put your baby in the toddler seat once she is a bit bigger ... is that an additional buy or it is just the laying down part pushed into a seated position?