For some time I have been using a Pi2B with an official 7" touchscreen as a remote controller for my Pi3b brained robot. It uses the installed VNC Viewer to connect headlessly with the robot.
I have just (17/06/2017) carried out an apt-get dist-upgrade and find that the size of the updated VNC Viewer window is too large for the screen. As none of the window control buttons (minimise, resize, exit) are visible the only way I can exit the program is to shut down the Pi by disconnecting the power.
Is there any way of configuring VNC Viewer to use a smaller window without having to start VNC Viewer as no menus are visible and no other program, including the terminal, can be accessed once the Viewer is opened?