I tried aspect ratio to no avail, as a matter of fact there was no option to change from Full to any other option in the HDMI! input. I’m working on that, but it just might be the nature of the HDMI blade in this particular old Panasonic monitor TH-50PHD8UK.
What I did find that worked was something called DISPLAY SIZE, it reduces the display size by 95%. I have to go into a hidden menu each time and set this function to ON in order to see the Win !0 in full image, the turn it OFF each time to use it in the TV function.
As mentioned I’m still working on this Panasonic option menu problem because I’d like full use of my Harmony remote to turn all functions on and off for the Byte3.