According to Kevin Acee, the San Diego Padres appear likely to give Fernando Tatis Jr.center field reps.
Now, it is not uncommon for teams to use spring training as an opportunity to give players time at a new position. There are a number of reasons teams do this.
Often, the purpose is to maximize flexibility for when injuries occur or for unique game circumstances. Other times, it is with the intent to move a player to a position full-time or to see if a player is even capable of such a move.