The Settings View is used to configure the settings for the QGroundControl application (rather than a specific vehicle). You do not have to have a vehicle connected to change these values.
You can switch between the various settings options by clicking the buttons in the left-sidebar.
The main application configuration settings. These are used to specify: display units, autoconnection devices, video display and storage, RTK GPS, etc.
Allows you to manually create communication links and connect to them. Keep in mind that normally this is not needed since QGroundControl will automatically connect to the most common devices.
Allows you to cache maps for use while you have no Internet connection.
Settings associated with the MAVLink connection to a vehicle.
Used to capture application logs for help with diagnosing application problems.