AutoFocus is a functionality introduced by version 1.2.0 of the VNC Client.
Touch the screen of 1.5 second without moving. Then the autofocus mode is activated, zooming on the screen from the touching position as long as the screen is touched.
In autofocus mode, a notification icon is displayed in the status bar as shown on this picture :
AutoFocus is a convenient mode for accessing quickly an area of the remote screen and then to perform mouse actions.
AutoFocus is available in zoom, move and mouse modes.