The middle button with the circular arrow symbol is typically used for performing an "auto-pan" or automatic tour function, which allows the camera to execute a preset pattern of movements. This may involve the camera moving through a range of motions automatically, which can appear random if it hasn't been set up with specific waypoints or patterns yet.
As for scanning through presets you've set up, many PTZ (Pan-Tilt-Zoom) cameras offer a feature called "tour" or "patrol," which allows you to set up a series of preset positions and have the camera move between them automatically. You'll need to configure these settings in the camera's application or interface. Be sure to check the user manual or the help section of the HiP2P Client software for guidance on setting up tours or patrols with your specific camera model.