Welcome to RCU, eStrike!

For FMS simulator, you can select an automatic zoom of your model in flight by hitting the Z key.

Also, you can do a manual zoom by pressing the + and - keys, for both modes (normal and chase).

The camera should be following the model in the air, just like the RC pilot does in real life.
In order to achieve that, select the "fixed camera" option from the View menu.

Keep asking questions and practicing!