How many subjects can DJI RS 3 Pro follow using ActiveTrack?

One.

Related Questions

What is the best drone for professional filming?

We recommend the following drones for filming and shooting cinematic-quality content...

What is the maximum number of devices that can be connected at the same time when using DJI FlightHub 2?

There is no limit.

Best drone with a thermal camera?

Among the top choices for a thermal drone are the DJI Matrice 4T, Matrice 4TD, and the Dock 3 with M4TD.