I reinstalled the "Standalone" many times, tested the card's dedicated settings in the Panel Control, and tried various drivers, strange to say even the initial drive of the card dated 2017 ver. 378.78 and with DCS it works at maximum resolution, but obviously unsuitable for the rest of the programs.
In the end just out of curiosity I installed DCS on "Steam" and it works at Max resolutions, as you can see something doesn't add up, and given that I'm not a Steam fan.
If you have any suggestions, they will be very welcome.
Thanks, bye
