The toolbar at the bottom of the screen lets you switch the view. Swipe it left-right to see all buttons.

The Sky view shows satellites in the sky at your location.

The status bar at top of the screen shows your location, and the simulated time. Current Location is your device's GPS coordinates.

Below the status bar are the sky chart's center coordinates, and the field of view width x height.

Tap-and-hold the + and - zoom buttons to zoom in and out. Or pinch the screen with your fingers!