Answer
On Apex Legends PC, open Settings, go to Video, and find Field of View.
The EA official PC settings article and accessibility features article both treat FOV as an adjustable item. There is no fixed recommended value here — balance the trade-off between visibility, comfort, and motion sickness.
Caveats
A higher FOV is not automatically better. It can make distant targets look smaller, increase PC load, and change motion sickness for some players.