Very quickly, in Baldur's Gate 3, you'll be presented with multiple companions to have in your party, with more unlocked in the early hours. If you chose an origin character, you'll still quickly get a four-person party, but if you created a custom character, you'll have four additional companions to fill out the remaining three spots.
Baldur’s Gate 3: How To Switch Out Party Members
Party members are a necessity to survive the world of Baldur’s Gate 3; here’s how to switch them out and use other companions in your party.